diff --git a/lib/herb/engine.rb b/lib/herb/engine.rb
index db193a916..5bfb8e4d5 100644
--- a/lib/herb/engine.rb
+++ b/lib/herb/engine.rb
@@ -131,9 +131,17 @@ def initialize(input, properties = {})
 
       action_view_helpers = @optimize && source_may_contain_action_view_helpers?(input)
       transform_conditionals = @optimize && action_view_helpers
-      parse_result = ::Herb.parse(input, **@parser_options, track_whitespace: true,
-                                                            action_view_helpers: action_view_helpers,
-                                                            transform_conditionals: transform_conditionals)
+      render_nodes = @optimize && input.include?("render")
+
+      parse_result = ::Herb.parse(
+        input,
+        **@parser_options,
+        track_whitespace: true,
+        action_view_helpers: action_view_helpers,
+        transform_conditionals: transform_conditionals,
+        render_nodes: render_nodes
+      )
+
       ast = parse_result.value
       parser_errors = parse_result.errors
 
@@ -159,7 +167,19 @@ def initialize(input, properties = {})
           ast.accept(visitor)
         end
 
-        compiler = Compiler.new(self, properties)
+        compiler_options = properties.dup
+
+        if @optimize && render_nodes && properties.fetch(:inline_render, false)
+          require_relative "engine/render_inliner"
+
+          compiler_options[:render_inliner] = RenderInliner.new(
+            self,
+            project_path: @project_path,
+            filename: @relative_file_path
+          )
+        end
+
+        compiler = Compiler.new(self, compiler_options)
 
         ast.accept(compiler)
 
diff --git a/lib/herb/engine/compiler.rb b/lib/herb/engine/compiler.rb
index bdf551baa..201a074b5 100644
--- a/lib/herb/engine/compiler.rb
+++ b/lib/herb/engine/compiler.rb
@@ -18,6 +18,7 @@ def initialize(engine, options = {})
 
         @engine = engine
         @escape = options.fetch(:escape) { options.fetch(:escape_html, false) }
+        @render_inliner = options[:render_inliner]
         @tokens = [] #: Array[untyped]
         @element_stack = [] #: Array[String]
         @context_stack = [:html_content]
@@ -215,6 +216,18 @@ def visit_erb_content_node(node)
         process_erb_tag(node)
       end
 
+      def visit_erb_render_node(node)
+        if @render_inliner&.can_inline?(node)
+          if @render_inliner.collection?(node)
+            inline_collection(node)
+          else
+            inline_partial(node)
+          end
+        else
+          process_erb_tag(node)
+        end
+      end
+
       def visit_erb_control_node(node, &)
         if node.content
           apply_trim(node, node.content.value.strip)
@@ -358,6 +371,51 @@ def visit_erb_control_with_parts(node, *parts)
 
       private
 
+      def inline_partial(node)
+        resolved_path = @render_inliner.resolve_path(node)
+        return process_erb_tag(node) unless resolved_path
+
+        source = File.read(resolved_path)
+        locals = @render_inliner.local_assignments(node)
+
+        @render_inliner.push(resolved_path)
+
+        add_code("begin")
+        locals.each { |name, value| add_code("; #{name} = (#{value})") }
+        add_code(";")
+
+        partial_ast = @render_inliner.parse(source)
+        partial_ast&.accept(self)
+
+        add_code("; end;")
+
+        @render_inliner.pop(resolved_path)
+      end
+
+      def inline_collection(node)
+        resolved_path = @render_inliner.resolve_path(node)
+        return process_erb_tag(node) unless resolved_path
+
+        source = File.read(resolved_path)
+        collection_expr = @render_inliner.collection_expression(node)
+        item_name = @render_inliner.collection_item_name(node)
+        counter_name = "#{item_name}_counter"
+        locals = @render_inliner.local_assignments(node)
+
+        @render_inliner.push(resolved_path)
+
+        add_code("; __herb_collection = (#{collection_expr}); __herb_collection.each_with_index do |#{item_name}, #{counter_name}|")
+        locals.each { |name, value| add_code("; #{name} = (#{value})") }
+        add_code(";")
+
+        partial_ast = @render_inliner.parse(source)
+        partial_ast&.accept(self)
+
+        add_code("; end;")
+
+        @render_inliner.pop(resolved_path)
+      end
+
       def check_for_escaped_erb_tag!(opening)
         return unless opening.start_with?("<%%")
 
diff --git a/lib/herb/engine/render_inliner.rb b/lib/herb/engine/render_inliner.rb
new file mode 100644
index 000000000..b67c168de
--- /dev/null
+++ b/lib/herb/engine/render_inliner.rb
@@ -0,0 +1,166 @@
+# frozen_string_literal: true
+
+module Herb
+  class Engine
+    class RenderInliner
+      def initialize(engine, options = {})
+        @engine = engine
+        @project_path = options[:project_path] || Pathname.new(Dir.pwd)
+        @filename = options[:filename]
+        @view_root = find_view_root
+        @source_directory = find_source_directory
+        @inlining_stack = Set.new
+      end
+
+      def can_inline?(node)
+        return false unless @view_root
+        return false unless node.static_partial?
+        return false if node.body&.any?
+
+        return can_inline_collection?(node) if node.keywords&.collection
+
+        resolved = resolve_path(node)
+        return false unless resolved
+        return false if @inlining_stack.include?(resolved.to_s)
+        return false unless safe_to_inline?(resolved)
+
+        true
+      end
+
+      def can_inline_collection?(node)
+        return false unless node.static_partial?
+        return false if node.keywords&.spacer_template
+
+        resolved = resolve_path(node)
+        return false unless resolved
+        return false if @inlining_stack.include?(resolved.to_s)
+        return false unless safe_to_inline?(resolved)
+
+        true
+      end
+
+      def collection?(node)
+        !!node.keywords&.collection
+      end
+
+      def collection_expression(node)
+        node.keywords&.collection&.value
+      end
+
+      def collection_item_name(node)
+        as_name = node.keywords&.as_name&.value
+        return as_name if as_name
+
+        partial = node.partial_path
+        return nil unless partial
+
+        File.basename(partial)
+      end
+
+      def resolve_path(node)
+        node.resolve(view_root: @view_root, source_directory: @source_directory)
+      end
+
+      def optimizable_renders(ast)
+        collector = OptimizableRenderCollector.new(self)
+        ast.accept(collector)
+        collector.results
+      end
+
+      def local_assignments(node)
+        locals = {} #: Hash[String, String]
+
+        node.keywords&.locals&.each do |local|
+          name = local.name&.value
+          value = local.value&.content
+
+          next unless name && value
+
+          value = name if value == "#{name}:" # Shorthand hash syntax
+
+          locals[name] = value
+        end
+
+        locals
+      end
+
+      def parse(source)
+        result = ::Herb.parse(
+          source,
+          render_nodes: true,
+          track_whitespace: true,
+          action_view_helpers: true,
+          transform_conditionals: true
+        )
+
+        result.value
+      end
+
+      def push(path)
+        @inlining_stack.add(path.to_s)
+      end
+
+      def pop(path)
+        @inlining_stack.delete(path.to_s)
+      end
+
+      private
+
+      def safe_to_inline?(file_path)
+        source = File.read(file_path)
+
+        return false if source.include?("content_for")
+        return false if source.match?(/\byield\b/)
+        return false if source.include?("local_assigns")
+
+        true
+      end
+
+      def find_view_root
+        candidates = [
+          @project_path.join("app", "views")
+        ]
+
+        candidates.find(&:directory?)
+      end
+
+      def find_source_directory
+        return nil unless @filename && @view_root
+
+        dir = Pathname.new(@filename).dirname
+        @view_root.join(dir)
+      end
+    end
+
+    class OptimizableRenderCollector < ::Herb::Visitor
+      attr_reader :results
+
+      def initialize(inliner)
+        super()
+        @inliner = inliner
+        @results = [] #: Array[Hash[Symbol, untyped]]
+      end
+
+      def visit_erb_render_node(node)
+        if @inliner.can_inline?(node)
+          entry = {
+            node: node,
+            partial_path: node.partial_path,
+            resolved_path: @inliner.resolve_path(node),
+            locals: @inliner.local_assignments(node),
+            collection: @inliner.collection?(node),
+          }
+
+          if entry[:collection]
+            entry[:collection_expression] = @inliner.collection_expression(node)
+            entry[:item_name] = @inliner.collection_item_name(node)
+          end
+
+          @results << entry
+        end
+
+        visit_child_nodes(node)
+      end
+    end
+  end
+end
diff --git a/sig/herb/engine/compiler.rbs b/sig/herb/engine/compiler.rbs
index 638c28149..672b2ee30 100644
--- a/sig/herb/engine/compiler.rbs
+++ b/sig/herb/engine/compiler.rbs
@@ -61,6 +61,8 @@ module Herb
 
       def visit_erb_content_node: (untyped node) -> untyped
 
+      def visit_erb_render_node: (untyped node) -> untyped
+
       def visit_erb_control_node: (untyped node) ?{ (?) -> untyped } -> untyped
 
       def visit_erb_if_node: (untyped node) -> untyped
@@ -101,6 +103,10 @@ module Herb
 
       private
 
+      def inline_partial: (untyped node) -> untyped
+
+      def inline_collection: (untyped node) -> untyped
+
       def check_for_escaped_erb_tag!: (untyped opening) -> untyped
 
       def current_context: () -> untyped
diff --git a/sig/herb/engine/render_inliner.rbs b/sig/herb/engine/render_inliner.rbs
new file mode 100644
index 000000000..693fcffc6
--- /dev/null
+++ b/sig/herb/engine/render_inliner.rbs
@@ -0,0 +1,47 @@
+# Generated from lib/herb/engine/render_inliner.rb with RBS::Inline
+
+module Herb
+  class Engine
+    class RenderInliner
+      def initialize: (untyped engine, ?untyped options) -> untyped
+
+      def can_inline?: (untyped node) -> untyped
+
+      def can_inline_collection?: (untyped node) -> untyped
+
+      def collection?: (untyped node) -> untyped
+
+      def collection_expression: (untyped node) -> untyped
+
+      def collection_item_name: (untyped node) -> untyped
+
+      def resolve_path: (untyped node) -> untyped
+
+      def optimizable_renders: (untyped ast) -> untyped
+
+      def local_assignments: (untyped node) -> untyped
+
+      def parse: (untyped source) -> untyped
+
+      def push: (untyped path) -> untyped
+
+      def pop: (untyped path) -> untyped
+
+      private
+
+      def safe_to_inline?: (untyped file_path) -> untyped
+
+      def find_view_root: () -> untyped
+
+      def find_source_directory: () -> untyped
+    end
+
+    class OptimizableRenderCollector < ::Herb::Visitor
+      attr_reader results: untyped
+
+      def initialize: (untyped inliner) -> untyped
+
+      def visit_erb_render_node: (untyped node) -> untyped
+    end
+  end
+end
diff --git a/test/engine/render_inliner_test.rb b/test/engine/render_inliner_test.rb
new file mode 100644
index 000000000..9b104a8d2
--- /dev/null
+++ b/test/engine/render_inliner_test.rb
@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+
+require_relative "../test_helper"
+require_relative "../snapshot_utils"
+require_relative "../../lib/herb/engine"
+
+module Engine
+  class RenderInlinerTest < Minitest::Spec
+    include SnapshotUtils
+
+    PROJECT_PATH = "test/fixtures/render_inliner"
+
+    test "inlines a simple partial" do
+      assert_compiled_snapshot('<%= render "shared/header" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "inlines partial with locals" do
+      assert_compiled_snapshot('<%= render partial: "posts/card", locals: { title: @post.title } %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "does not inline dynamic render" do
+      assert_compiled_snapshot("<%= render @product %>", filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "does not inline when optimize is false" do
+      assert_compiled_snapshot('<%= render "shared/header" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: false, escape: false)
+    end
+
+    test "does not inline partial with yield" do
+      assert_compiled_snapshot('<%= render "shared/wrapper" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "does not inline partial with content_for" do
+      assert_compiled_snapshot('<%= render "shared/sidebar" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "does not inline partial with local_assigns" do
+      assert_compiled_snapshot('<%= render "shared/item" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "inlines collection renders" do
+      assert_compiled_snapshot('<%= render partial: "posts/post", collection: @posts %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "inlines collection with as: option" do
+      assert_compiled_snapshot('<%= render partial: "posts/post", collection: @posts, as: :item %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "does not inline collection with spacer_template" do
+      assert_compiled_snapshot('<%= render partial: "posts/post", collection: @posts, spacer_template: "posts/spacer" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "inlines nested partials" do
+      assert_compiled_snapshot('<%= render "shared/outer" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "detects circular references and falls back" do
+      assert_compiled_snapshot('<%= render "shared/a" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "scopes locals with begin/end block" do
+      assert_compiled_snapshot('<%= render partial: "posts/card", locals: { name: "test" } %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "falls back for unresolvable partial" do
+      assert_compiled_snapshot('<%= render "nonexistent/missing" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "handles Ruby 3.1 shorthand hash locals" do
+      assert_compiled_snapshot('<%= render partial: "posts/card", locals: { title: } %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "inlines shorthand render with inline locals" do
+      assert_compiled_snapshot('<%= render "posts/card", title: "Title" %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+
+    test "inlines shorthand render with multiple inline locals" do
+      assert_compiled_snapshot('<%= render "posts/card", title: "Title", name: @user.name %>', filename: "app/views/posts/index.html.erb", project_path: PROJECT_PATH, optimize: true, inline_render: true, escape: false)
+    end
+  end
+end
diff --git a/test/fixtures/render_inliner/app/views/posts/_card.html.erb b/test/fixtures/render_inliner/app/views/posts/_card.html.erb
new file mode 100644
index 000000000..90f33f56e
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/posts/_card.html.erb
@@ -0,0 +1 @@
+<div><%= title %></div>
diff --git a/test/fixtures/render_inliner/app/views/posts/_post.html.erb b/test/fixtures/render_inliner/app/views/posts/_post.html.erb
new file mode 100644
index 000000000..fc9a37462
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/posts/_post.html.erb
@@ -0,0 +1 @@
+<div>Post</div>
diff --git a/test/fixtures/render_inliner/app/views/posts/_spacer.html.erb b/test/fixtures/render_inliner/app/views/posts/_spacer.html.erb
new file mode 100644
index 000000000..e123ba7e3
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/posts/_spacer.html.erb
@@ -0,0 +1 @@
+<hr>
diff --git a/test/fixtures/render_inliner/app/views/shared/_a.html.erb b/test/fixtures/render_inliner/app/views/shared/_a.html.erb
new file mode 100644
index 000000000..df26f4170
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/shared/_a.html.erb
@@ -0,0 +1 @@
+<%= render "shared/b" %>
diff --git a/test/fixtures/render_inliner/app/views/shared/_b.html.erb b/test/fixtures/render_inliner/app/views/shared/_b.html.erb
new file mode 100644
index 000000000..d5ed9a10b
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/shared/_b.html.erb
@@ -0,0 +1 @@
+<%= render "shared/a" %>
diff --git a/test/fixtures/render_inliner/app/views/shared/_header.html.erb b/test/fixtures/render_inliner/app/views/shared/_header.html.erb
new file mode 100644
index 000000000..ae6b431c0
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/shared/_header.html.erb
@@ -0,0 +1 @@
+<header>Hello</header>
diff --git a/test/fixtures/render_inliner/app/views/shared/_inner.html.erb b/test/fixtures/render_inliner/app/views/shared/_inner.html.erb
new file mode 100644
index 000000000..291277aa0
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/shared/_inner.html.erb
@@ -0,0 +1 @@
+<span>Inner</span>
diff --git a/test/fixtures/render_inliner/app/views/shared/_item.html.erb b/test/fixtures/render_inliner/app/views/shared/_item.html.erb
new file mode 100644
index 000000000..66869596c
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/shared/_item.html.erb
@@ -0,0 +1 @@
+<%= local_assigns[:name] %>
diff --git a/test/fixtures/render_inliner/app/views/shared/_outer.html.erb b/test/fixtures/render_inliner/app/views/shared/_outer.html.erb
new file mode 100644
index 000000000..5d9eedc47
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/shared/_outer.html.erb
@@ -0,0 +1 @@
+<p>Outer<%= render "shared/inner" %></p>
diff --git a/test/fixtures/render_inliner/app/views/shared/_sidebar.html.erb b/test/fixtures/render_inliner/app/views/shared/_sidebar.html.erb
new file mode 100644
index 000000000..86bce3b61
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/shared/_sidebar.html.erb
@@ -0,0 +1 @@
+<%= content_for :sidebar %>
diff --git a/test/fixtures/render_inliner/app/views/shared/_wrapper.html.erb b/test/fixtures/render_inliner/app/views/shared/_wrapper.html.erb
new file mode 100644
index 000000000..1c26cb986
--- /dev/null
+++ b/test/fixtures/render_inliner/app/views/shared/_wrapper.html.erb
@@ -0,0 +1 @@
+<div><%= yield %></div>
diff --git a/test/snapshots/engine/evaluation_test/test_0022_complex_real_world_example_d8e54f09b6cf5d8199c941a30266ede6.txt b/test/snapshots/engine/evaluation_test/test_0022_complex_real_world_example_d8e54f09b6cf5d8199c941a30266ede6.txt
new file mode 100644
index 000000000..722cb3b32
--- /dev/null
+++ b/test/snapshots/engine/evaluation_test/test_0022_complex_real_world_example_d8e54f09b6cf5d8199c941a30266ede6.txt
@@ -0,0 +1,66 @@
+---
+source: "Engine::EvaluationTest#test_0022_complex real world example"
+input: "{source: \"<!DOCTYPE html>\\n<html>\\n  <head>\\n    <title><%= page_title %></title>\\n    <meta name=\\\"description\\\" content=\\\"<%= meta_description %>\\\">\\n  </head>\\n  <body class=\\\"<%= body_classes.join(' ') %>\\\">\\n    <header>\\n      <h1><%= site_name %></h1>\\n      <nav>\\n        <% navigation_items.each do |item| %>\\n          <a href=\\\"<%= item[:url] %>\\\" class=\\\"<%= item[:active] ? 'active' : '' %>\\\">\\n            <%= item[:title] %>\\n          </a>\\n        <% end %>\\n      </nav>\\n    </header>\\n    \\n    <main>\\n      <% if flash_message %>\\n        <div class=\\\"alert alert-<%= flash_type %>\\\">\\n          <%= flash_message %>\\n        </div>\\n      <% end %>\\n      \\n      <section class=\\\"content\\\">\\n        <% unless posts.empty? %>\\n          <% posts.each_with_index do |post, index| %>\\n            <article class=\\\"post\\\" data-index=\\\"<%= index %>\\\">\\n              <h2><%= post.title %></h2>\\n              <p class=\\\"meta\\\">\\n                By <%= post.author %> on <%= post.date.strftime(\\\"%B %d, %Y\\\") %>\\n              </p>\\n              <div class=\\\"content\\\">\\n                <%= post.excerpt %>\\n              </div>\\n              <% if post.tags.any? %>\\n                <div class=\\\"tags\\\">\\n                  <% post.tags.each do |tag| %>\\n                    <span class=\\\"tag\\\"><%= tag %></span>\\n                  <% end %>\\n                </div>\\n              <% end %>\\n            </article>\\n          <% end %>\\n        <% else %>\\n          <p class=\\\"no-posts\\\">No posts available.</p>\\n        <% end %>\\n      </section>\\n    </main>\\n    \\n    <footer>\\n      <p>&copy; <%= Date.new(2025, 12, 31).year %> <%= site_name %></p>\\n    </footer>\\n  </body>\\n</html>\\n\", locals: {page_title: \"My Blog\", meta_description: \"A blog about programming\", body_classes: [\"blog\", \"home\"], site_name: \"My Awesome Blog\", navigation_items: [{title: \"Home\", url: \"/\", active: true}, {title: \"About\", url: \"/about\", active: false}, {title: \"Contact\", url: \"/contact\", active: false}], flash_message: \"Welcome!\", flash_type: \"success\", posts: [#<struct Engine::EvaluationTest::Post title=\"First Post\", author=\"John Doe\", date=#<Date: 2024-01-15 ((2460325j,0s,0n),+0s,2299161j)>, excerpt=\"This is the first post excerpt.\", tags=[\"ruby\", \"programming\"]>, #<struct Engine::EvaluationTest::Post title=\"Second Post\", author=\"Jane Smith\", date=#<Date: 2024-02-01 ((2460342j,0s,0n),+0s,2299161j)>, excerpt=\"This is the second post excerpt.\", tags=[\"html\", \"css\"]>]}, options: {escape: false}}"
+---
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>My Blog</title>
+    <meta name="description" content="A blog about programming">
+  </head>
+  <body class="blog home">
+    <header>
+      <h1>My Awesome Blog</h1>
+      <nav>
+          <a href="/" class="active">
+            Home
+          </a>
+          <a href="/about" class="">
+            About
+          </a>
+          <a href="/contact" class="">
+            Contact
+          </a>
+      </nav>
+    </header>
+    
+    <main>
+        <div class="alert alert-success">
+          Welcome!
+        </div>
+      
+      <section class="content">
+            <article class="post" data-index="0">
+              <h2>First Post</h2>
+              <p class="meta">
+                By John Doe on January 15, 2024
+              </p>
+              <div class="content">
+                This is the first post excerpt.
+              </div>
+                <div class="tags">
+                    <span class="tag">ruby</span>
+                    <span class="tag">programming</span>
+                </div>
+            </article>
+            <article class="post" data-index="1">
+              <h2>Second Post</h2>
+              <p class="meta">
+                By Jane Smith on February 01, 2024
+              </p>
+              <div class="content">
+                This is the second post excerpt.
+              </div>
+                <div class="tags">
+                    <span class="tag">html</span>
+                    <span class="tag">css</span>
+                </div>
+            </article>
+      </section>
+    </main>
+    
+    <footer>
+      <p>&copy; 2025 My Awesome Blog</p>
+    </footer>
+  </body>
+</html>
diff --git a/test/snapshots/engine/render_inliner_test/test_0001_inlines_a_simple_partial_603df3fe395b10fa9c997c61ff9a15f9.txt b/test/snapshots/engine/render_inliner_test/test_0001_inlines_a_simple_partial_603df3fe395b10fa9c997c61ff9a15f9.txt
new file mode 100644
index 000000000..c5059c766
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0001_inlines_a_simple_partial_603df3fe395b10fa9c997c61ff9a15f9.txt
@@ -0,0 +1,7 @@
+---
+source: "Engine::RenderInlinerTest#test_0001_inlines a simple partial"
+input: "{source: \"<%= render \\\"shared/header\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; begin; ;; _buf << '<header>Hello</header>
+'.freeze; ; end;;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0002_inlines_partial_with_locals_95135940db611a0a5e761afc44f22616.txt b/test/snapshots/engine/render_inliner_test/test_0002_inlines_partial_with_locals_95135940db611a0a5e761afc44f22616.txt
new file mode 100644
index 000000000..a70a2abb4
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0002_inlines_partial_with_locals_95135940db611a0a5e761afc44f22616.txt
@@ -0,0 +1,7 @@
+---
+source: "Engine::RenderInlinerTest#test_0002_inlines partial with locals"
+input: "{source: \"<%= render partial: \\\"posts/card\\\", locals: { title: @post.title } %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; begin; ; title = (@post.title); ;; _buf << '<div>'.freeze; _buf << (title).to_s; _buf << '</div>
+'.freeze; ; end;;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0003_does_not_inline_dynamic_render_d4b9ae2333f9edd9d350a39182291bce.txt b/test/snapshots/engine/render_inliner_test/test_0003_does_not_inline_dynamic_render_d4b9ae2333f9edd9d350a39182291bce.txt
new file mode 100644
index 000000000..1b7771c4b
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0003_does_not_inline_dynamic_render_d4b9ae2333f9edd9d350a39182291bce.txt
@@ -0,0 +1,6 @@
+---
+source: "Engine::RenderInlinerTest#test_0003_does not inline dynamic render"
+input: "{source: \"<%= render @product %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; _buf << (render @product).to_s;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0004_does_not_inline_when_optimize_is_false_edfdb37e0ee42d3137ab9f6954974e6e.txt b/test/snapshots/engine/render_inliner_test/test_0004_does_not_inline_when_optimize_is_false_edfdb37e0ee42d3137ab9f6954974e6e.txt
new file mode 100644
index 000000000..e3ce4e2fc
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0004_does_not_inline_when_optimize_is_false_edfdb37e0ee42d3137ab9f6954974e6e.txt
@@ -0,0 +1,6 @@
+---
+source: "Engine::RenderInlinerTest#test_0004_does not inline when optimize is false"
+input: "{source: \"<%= render \\\"shared/header\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: false, escape: false}}"
+---
+_buf = ::String.new; _buf << (render "shared/header").to_s;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0005_does_not_inline_partial_with_yield_614327996b5f80569bb8967a712a666d.txt b/test/snapshots/engine/render_inliner_test/test_0005_does_not_inline_partial_with_yield_614327996b5f80569bb8967a712a666d.txt
new file mode 100644
index 000000000..e865db3c4
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0005_does_not_inline_partial_with_yield_614327996b5f80569bb8967a712a666d.txt
@@ -0,0 +1,6 @@
+---
+source: "Engine::RenderInlinerTest#test_0005_does not inline partial with yield"
+input: "{source: \"<%= render \\\"shared/wrapper\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; _buf << (render "shared/wrapper").to_s;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0006_does_not_inline_partial_with_content_for_a745f9a05124c3f3ad68036a4bdd192f.txt b/test/snapshots/engine/render_inliner_test/test_0006_does_not_inline_partial_with_content_for_a745f9a05124c3f3ad68036a4bdd192f.txt
new file mode 100644
index 000000000..871e41eac
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0006_does_not_inline_partial_with_content_for_a745f9a05124c3f3ad68036a4bdd192f.txt
@@ -0,0 +1,6 @@
+---
+source: "Engine::RenderInlinerTest#test_0006_does not inline partial with content_for"
+input: "{source: \"<%= render \\\"shared/sidebar\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; _buf << (render "shared/sidebar").to_s;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0007_does_not_inline_partial_with_local_assigns_270738f467068b11565be247f854bf68.txt b/test/snapshots/engine/render_inliner_test/test_0007_does_not_inline_partial_with_local_assigns_270738f467068b11565be247f854bf68.txt
new file mode 100644
index 000000000..9e8974d30
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0007_does_not_inline_partial_with_local_assigns_270738f467068b11565be247f854bf68.txt
@@ -0,0 +1,6 @@
+---
+source: "Engine::RenderInlinerTest#test_0007_does not inline partial with local_assigns"
+input: "{source: \"<%= render \\\"shared/item\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; _buf << (render "shared/item").to_s;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0008_inlines_collection_renders_2b36b6c15d03c691c65df99d2dcbb6bf.txt b/test/snapshots/engine/render_inliner_test/test_0008_inlines_collection_renders_2b36b6c15d03c691c65df99d2dcbb6bf.txt
new file mode 100644
index 000000000..a59324efd
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0008_inlines_collection_renders_2b36b6c15d03c691c65df99d2dcbb6bf.txt
@@ -0,0 +1,7 @@
+---
+source: "Engine::RenderInlinerTest#test_0008_inlines collection renders"
+input: "{source: \"<%= render partial: \\\"posts/post\\\", collection: @posts %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; ; __herb_collection = (@posts); __herb_collection.each_with_index do |post, post_counter|; ;; _buf << '<div>Post</div>
+'.freeze; ; end;;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0009_inlines_collection_with_as_option_c959e2228d7be537f50a0415f1c9b577.txt b/test/snapshots/engine/render_inliner_test/test_0009_inlines_collection_with_as_option_c959e2228d7be537f50a0415f1c9b577.txt
new file mode 100644
index 000000000..16f637679
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0009_inlines_collection_with_as_option_c959e2228d7be537f50a0415f1c9b577.txt
@@ -0,0 +1,7 @@
+---
+source: "Engine::RenderInlinerTest#test_0009_inlines collection with as: option"
+input: "{source: \"<%= render partial: \\\"posts/post\\\", collection: @posts, as: :item %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; ; __herb_collection = (@posts); __herb_collection.each_with_index do |item, item_counter|; ;; _buf << '<div>Post</div>
+'.freeze; ; end;;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0010_does_not_inline_collection_with_spacer_template_1a8e2afa971bed617e1ca00a7b672f7e.txt b/test/snapshots/engine/render_inliner_test/test_0010_does_not_inline_collection_with_spacer_template_1a8e2afa971bed617e1ca00a7b672f7e.txt
new file mode 100644
index 000000000..446fa9d59
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0010_does_not_inline_collection_with_spacer_template_1a8e2afa971bed617e1ca00a7b672f7e.txt
@@ -0,0 +1,6 @@
+---
+source: "Engine::RenderInlinerTest#test_0010_does not inline collection with spacer_template"
+input: "{source: \"<%= render partial: \\\"posts/post\\\", collection: @posts, spacer_template: \\\"posts/spacer\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; _buf << (render partial: "posts/post", collection: @posts, spacer_template: "posts/spacer").to_s;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0011_inlines_nested_partials_d1b017469e1b907e2043c278abeef1a5.txt b/test/snapshots/engine/render_inliner_test/test_0011_inlines_nested_partials_d1b017469e1b907e2043c278abeef1a5.txt
new file mode 100644
index 000000000..7a223bb97
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0011_inlines_nested_partials_d1b017469e1b907e2043c278abeef1a5.txt
@@ -0,0 +1,8 @@
+---
+source: "Engine::RenderInlinerTest#test_0011_inlines nested partials"
+input: "{source: \"<%= render \\\"shared/outer\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; begin; ;; _buf << '<p>Outer'.freeze; begin; ;; _buf << '<span>Inner</span>
+'.freeze; ; end;; _buf << '</p>
+'.freeze; ; end;;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0012_detects_circular_references_and_falls_back_ffa0077aac262faa659ea5be61da7f83.txt b/test/snapshots/engine/render_inliner_test/test_0012_detects_circular_references_and_falls_back_ffa0077aac262faa659ea5be61da7f83.txt
new file mode 100644
index 000000000..937351609
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0012_detects_circular_references_and_falls_back_ffa0077aac262faa659ea5be61da7f83.txt
@@ -0,0 +1,8 @@
+---
+source: "Engine::RenderInlinerTest#test_0012_detects circular references and falls back"
+input: "{source: \"<%= render \\\"shared/a\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; begin; ;; begin; ;; _buf << (render "shared/a").to_s; _buf << '
+'.freeze; ; end;; _buf << '
+'.freeze; ; end;;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0013_scopes_locals_with_begin_end_block_eed6faed6d9f587a049f5e651c305a4c.txt b/test/snapshots/engine/render_inliner_test/test_0013_scopes_locals_with_begin_end_block_eed6faed6d9f587a049f5e651c305a4c.txt
new file mode 100644
index 000000000..185818a72
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0013_scopes_locals_with_begin_end_block_eed6faed6d9f587a049f5e651c305a4c.txt
@@ -0,0 +1,7 @@
+---
+source: "Engine::RenderInlinerTest#test_0013_scopes locals with begin/end block"
+input: "{source: \"<%= render partial: \\\"posts/card\\\", locals: { name: \\\"test\\\" } %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; begin; ; name = ("test"); ;; _buf << '<div>'.freeze; _buf << (title).to_s; _buf << '</div>
+'.freeze; ; end;;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0014_falls_back_for_unresolvable_partial_6b2741fc46cb17dbbbaab71cefbf48dd.txt b/test/snapshots/engine/render_inliner_test/test_0014_falls_back_for_unresolvable_partial_6b2741fc46cb17dbbbaab71cefbf48dd.txt
new file mode 100644
index 000000000..7f0b14cb5
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0014_falls_back_for_unresolvable_partial_6b2741fc46cb17dbbbaab71cefbf48dd.txt
@@ -0,0 +1,6 @@
+---
+source: "Engine::RenderInlinerTest#test_0014_falls back for unresolvable partial"
+input: "{source: \"<%= render \\\"nonexistent/missing\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; _buf << (render "nonexistent/missing").to_s;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0015_handles_Ruby_3.1_shorthand_hash_locals_37b2a50c3b7db3cfeff62565497a8174.txt b/test/snapshots/engine/render_inliner_test/test_0015_handles_Ruby_3.1_shorthand_hash_locals_37b2a50c3b7db3cfeff62565497a8174.txt
new file mode 100644
index 000000000..4df5919fd
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0015_handles_Ruby_3.1_shorthand_hash_locals_37b2a50c3b7db3cfeff62565497a8174.txt
@@ -0,0 +1,7 @@
+---
+source: "Engine::RenderInlinerTest#test_0015_handles Ruby 3.1 shorthand hash locals"
+input: "{source: \"<%= render partial: \\\"posts/card\\\", locals: { title: } %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; begin; ; title = (title); ;; _buf << '<div>'.freeze; _buf << (title).to_s; _buf << '</div>
+'.freeze; ; end;;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0016_inlines_shorthand_render_with_inline_locals_b86766e862c57e3e004ab4073580e1ce.txt b/test/snapshots/engine/render_inliner_test/test_0016_inlines_shorthand_render_with_inline_locals_b86766e862c57e3e004ab4073580e1ce.txt
new file mode 100644
index 000000000..ecb7df640
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0016_inlines_shorthand_render_with_inline_locals_b86766e862c57e3e004ab4073580e1ce.txt
@@ -0,0 +1,7 @@
+---
+source: "Engine::RenderInlinerTest#test_0016_inlines shorthand render with inline locals"
+input: "{source: \"<%= render \\\"posts/card\\\", title: \\\"Title\\\" %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; begin; ; title = ("Title"); ;; _buf << '<div>'.freeze; _buf << (title).to_s; _buf << '</div>
+'.freeze; ; end;;
+_buf.to_s
diff --git a/test/snapshots/engine/render_inliner_test/test_0017_inlines_shorthand_render_with_multiple_inline_locals_ff0e362cc9121c9f7c204ba9fcad8dbe.txt b/test/snapshots/engine/render_inliner_test/test_0017_inlines_shorthand_render_with_multiple_inline_locals_ff0e362cc9121c9f7c204ba9fcad8dbe.txt
new file mode 100644
index 000000000..34aa3b2ca
--- /dev/null
+++ b/test/snapshots/engine/render_inliner_test/test_0017_inlines_shorthand_render_with_multiple_inline_locals_ff0e362cc9121c9f7c204ba9fcad8dbe.txt
@@ -0,0 +1,7 @@
+---
+source: "Engine::RenderInlinerTest#test_0017_inlines shorthand render with multiple inline locals"
+input: "{source: \"<%= render \\\"posts/card\\\", title: \\\"Title\\\", name: @user.name %>\", options: {filename: \"app/views/posts/index.html.erb\", project_path: \"test/fixtures/render_inliner\", optimize: true, inline_render: true, escape: false}}"
+---
+_buf = ::String.new; begin; ; title = ("Title"); ; name = (@user.name); ;; _buf << '<div>'.freeze; _buf << (title).to_s; _buf << '</div>
+'.freeze; ; end;;
+_buf.to_s