diff --git a/src/corelib/kernel/qcore_mac_objc.mm b/src/corelib/kernel/qcore_mac_objc.mm
index 266faca0ed..cf9dafb6d8 100644
--- a/src/corelib/kernel/qcore_mac_objc.mm
+++ b/src/corelib/kernel/qcore_mac_objc.mm
@@ -140,7 +140,8 @@ QMacAutoReleasePool::QMacAutoReleasePool()
 {
     Class trackerClass = [QMacAutoReleasePoolTracker class];
 
-#ifdef QT_DEBUG
+// Patch: Disable this debug code because it is very slow.
+#ifdef QT_DEBUG____REMOVED
     void *poolFrame = nullptr;
     if (__builtin_available(macOS 10.14, iOS 12.0, tvOS 12.0, watchOS 5.0, *)) {
         void *frame;