diff --git a/uSync.Core/Cache/SyncEntityCache.cs b/uSync.Core/Cache/SyncEntityCache.cs
index c712560fe..2bcbcbb7e 100644
--- a/uSync.Core/Cache/SyncEntityCache.cs
+++ b/uSync.Core/Cache/SyncEntityCache.cs
@@ -47,7 +47,11 @@ public CachedName GetName(int id)
 
         public void AddName(int id, Guid guid, string name)
         {
-            nameCache.ClearByKey(id.ToString());
+            // was ClearByKey(id.ToString()) - a full LINQ scan of every entry in nameCache
+            // looking for a prefix match, on every single call. id.ToString() is an exact
+            // key here (no other key is ever a variant/suffix of it in this cache), so a
+            // direct single-key removal is correct and avoids the O(n) scan entirely.
+            nameCache.Clear(id.ToString());
             nameCache.GetCacheItem(id.ToString(), () =>
             {
                 return new CachedName(guid, name);
@@ -103,7 +107,8 @@ public IEntitySlim GetEntity(Guid id)
             }
             else
             {
-                keyCache.ClearByKey(id.ToString());
+                // was ClearByKey (O(n) scan) - id.ToString() is an exact key here too.
+                keyCache.Clear(id.ToString());
                 return null;
             }
         }
@@ -134,7 +139,8 @@ public IEntitySlim GetEntity(Guid id, UmbracoObjectTypes objectType)
             }
             else
             {
-                keyCache.ClearByKey(id.ToString());
+                // was ClearByKey (O(n) scan) - id.ToString() is an exact key here too.
+                keyCache.Clear(id.ToString());
                 return null;
             }
         }
diff --git a/uSync.Core/Serialization/Serializers/ContentTypeBaseSerializer.cs b/uSync.Core/Serialization/Serializers/ContentTypeBaseSerializer.cs
index 509e113a8..7b2dcf793 100644
--- a/uSync.Core/Serialization/Serializers/ContentTypeBaseSerializer.cs
+++ b/uSync.Core/Serialization/Serializers/ContentTypeBaseSerializer.cs
@@ -659,7 +659,9 @@ private void EnsureAliasCache()
         protected void ClearAliases()
         {
             aliasCache = null;
-            _appCache.ClearByKey($"usync_{this.Id}");
+            // was ClearByKey (O(n) scan of the whole shared RuntimeCache) - the key here is
+            // exact (this.Id is a single content type), so a direct removal is correct.
+            _appCache.Clear($"usync_{this.Id}");
         }
 
         protected void RemoveAlias(string alias)
@@ -675,7 +677,9 @@ protected void RemoveAlias(string alias)
 
         private void RefreshAliasCache()
         {
-            _appCache.ClearByKey($"usync_{this.Id}");
+            // was ClearByKey (O(n) scan of the whole shared RuntimeCache) - the key here is
+            // exact (this.Id is a single content type), so a direct removal is correct.
+            _appCache.Clear($"usync_{this.Id}");
             _appCache.GetCacheItem($"usync_{this.Id}", () => { return aliasCache; });
         }