diff --git a/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/EmbeddedLanguages/VirtualChars/CSharpVirtualCharService.cs b/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/EmbeddedLanguages/VirtualChars/CSharpVirtualCharService.cs
index 11f2d9ceff053..991dbfe11d3c8 100644
--- a/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/EmbeddedLanguages/VirtualChars/CSharpVirtualCharService.cs
+++ b/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/EmbeddedLanguages/VirtualChars/CSharpVirtualCharService.cs
@@ -23,6 +23,8 @@ internal class CSharpVirtualCharService : AbstractVirtualCharService
 {
     public static readonly IVirtualCharService Instance = new CSharpVirtualCharService();
 
+    private static readonly ObjectPool<ImmutableSegmentedList<VirtualChar>.Builder> s_pooledBuilders = new(() => ImmutableSegmentedList.CreateBuilder<VirtualChar>());
+
     protected CSharpVirtualCharService()
     {
     }
@@ -285,11 +287,20 @@ private static VirtualCharSequence CreateVirtualCharSequence(
         string tokenText, int offset, int startIndexInclusive, int endIndexExclusive, ArrayBuilder<(char ch, TextSpan span)> charResults)
     {
         // Second pass.  Convert those characters to Runes.
-        var runeResults = ImmutableSegmentedList.CreateBuilder<VirtualChar>();
+        using var pooledRuneResults = s_pooledBuilders.GetPooledObject();
+        var runeResults = pooledRuneResults.Object;
 
-        ConvertCharactersToRunes(charResults, runeResults);
+        try
+        {
+            ConvertCharactersToRunes(charResults, runeResults);
 
-        return CreateVirtualCharSequence(tokenText, offset, startIndexInclusive, endIndexExclusive, runeResults);
+            return CreateVirtualCharSequence(tokenText, offset, startIndexInclusive, endIndexExclusive, runeResults);
+        }
+        finally
+        {
+            // Ensure the builder is cleared out before releasing back to the pool.
+            runeResults.Clear();
+        }
     }
 
     private static void ConvertCharactersToRunes(ArrayBuilder<(char ch, TextSpan span)> charResults, ImmutableSegmentedList<VirtualChar>.Builder runeResults)