--- libmalloc/libmalloc-166.251.2/src/locking.h
+++ libmalloc/libmalloc-283.60.1/src/locking.h
@@ -45,7 +45,7 @@
 MALLOC_ALWAYS_INLINE
 static inline void
 _malloc_lock_lock(_malloc_lock_s *lock) {
-	return os_unfair_lock_lock_with_options(lock,
+	return os_unfair_lock_lock_with_options(lock, OS_UNFAIR_LOCK_ADAPTIVE_SPIN |
 			OS_UNFAIR_LOCK_DATA_SYNCHRONIZATION);
 }