diff --git a/src/Peachpie.CodeAnalysis/CodeGen/CodeGenerator.Emit.cs b/src/Peachpie.CodeAnalysis/CodeGen/CodeGenerator.Emit.cs
index b9ffac2877..8e6f2f8a9e 100644
--- a/src/Peachpie.CodeAnalysis/CodeGen/CodeGenerator.Emit.cs
+++ b/src/Peachpie.CodeAnalysis/CodeGen/CodeGenerator.Emit.cs
@@ -2583,11 +2583,11 @@ protected virtual void WriteBackAndFree(CodeGenerator cg)
 
             public static void WriteBackAndFree(CodeGenerator cg, IList<WriteBackInfo> writebacks)
             {
-                if (writebacks != null && writebacks.Count != 0)
+                if (writebacks != null)
                 {
-                    foreach (var w in writebacks)
+                    for (int i = 0; i < writebacks.Count; i++)
                     {
-                        w.WriteBackAndFree(cg);
+                        writebacks[i].WriteBackAndFree(cg);
                     }
                 }
             }
diff --git a/src/Peachpie.Library/Arrays.cs b/src/Peachpie.Library/Arrays.cs
index ecc95f5701..06118973d3 100644
--- a/src/Peachpie.Library/Arrays.cs
+++ b/src/Peachpie.Library/Arrays.cs
@@ -1,5 +1,6 @@
 using Pchp.Core;
 using Pchp.Core.Resources;
+using Pchp.Core.Utilities;
 using Pchp.Library.Resources;
 using System;
 using System.Collections;
@@ -533,8 +534,15 @@ public static PhpValue array_rand(PhpArray array, int count = 1)
         {
             if (count == 1)
             {
-                var result = new List<PhpValue>(1);
-                return RandomSubset(array.Keys, result, count, PhpMath.Generator) ? result[0] : PhpValue.Null;
+                var result = ListPool<PhpValue>.Pool.Get();
+                try
+                {
+                    return RandomSubset(array.Keys, result, count, PhpMath.Generator) ? result[0] : PhpValue.Null;
+                }
+                finally
+                {
+                    ListPool<PhpValue>.Pool.Return(result);
+                }
             }
             else
             {
diff --git a/src/Peachpie.Library/FileSystem.Glob.cs b/src/Peachpie.Library/FileSystem.Glob.cs
index da34327102..e7b85c03e3 100644
--- a/src/Peachpie.Library/FileSystem.Glob.cs
+++ b/src/Peachpie.Library/FileSystem.Glob.cs
@@ -148,13 +148,13 @@ public string MakeString()
             }
         }
 
-        sealed class GlobMatcher
+        sealed class GlobMatcher : IDisposable
         {
             readonly Context/*!*/_ctx;
             readonly string/*!*/ _pattern;
             readonly GlobOptions _flags;
-            readonly List<string>/*!*/ _result;
             readonly bool _dirOnly;
+            List<string>/*!*/ _result;
             bool _stripTwo;
             bool _relative;
             FnMatchOptions _fnMatchFlags;
@@ -172,12 +172,19 @@ public GlobMatcher(Context ctx, string/*!*/pattern, GlobOptions flags)
                 _ctx = ctx;
                 _pattern = pattern;
                 _flags = flags;
-                _result = new List<string>();
+                _result = ListPool<string>.Pool.Get();
                 _dirOnly = PathUtils.IsDirectorySeparator((char)_pattern.LastCharacter()) || (flags & GlobOptions.OnlyDir) != 0;
 
                 _fnMatchFlags = NoEscapes ? FnMatchOptions.NoEscape : FnMatchOptions.None;
             }
 
+            public void Dispose()
+            {
+                ListPool<string>.Pool.Return(_result);
+                _result = null;
+            }
+
+            bool IsDisposed => _result == null;
 
             private static string/*!*/ Unescape(string/*!*/ path, int start)
             {
@@ -243,6 +250,11 @@ private void TestPath(string path, int patternEnd, bool isLastPathSegment)
 
             internal List<string>/*!*/ DoGlob()
             {
+                if (IsDisposed)
+                {
+                    throw new ObjectDisposedException(nameof(GlobMatcher));
+                }
+
                 if (_pattern.Length == 0)
                 {
                     return _result;
@@ -790,7 +802,7 @@ static ValueList<string> UngroupGlobs(string/*!*/ pattern, bool noEscape, bool b
 
             foreach (string group in groups)
             {
-                var matcher = new GlobMatcher(ctx, group, flags);
+                using var matcher = new GlobMatcher(ctx, group, flags);
 
                 foreach (string filename in matcher.DoGlob())
                 {