diff --git a/test/test-stress.c b/test/test-stress.c
index be2a9c67..37572d42 100644
--- a/test/test-stress.c
+++ b/test/test-stress.c
@@ -17,8 +17,8 @@ terms of the MIT license.
 #include <mimalloc.h>
 
 // argument defaults
-static int THREADS = 32;    // more repeatable if THREADS <= #processors
-static int N       = 40;    // scaling factor
+static int THREADS = 8;    // more repeatable if THREADS <= #processors
+static int N       = 200;    // scaling factor
 
 // static int THREADS = 8;    // more repeatable if THREADS <= #processors
 // static int N       = 100;  // scaling factor
@@ -63,7 +63,11 @@ static bool chance(size_t perc, random_t r) {
 }
 
 static void* alloc_items(size_t items, random_t r) {
-  if (chance(1, r)) items *= 100; // 1% huge objects;
+  if (chance(1, r)) {
+    if (chance(1, r)) items *= 1000;       // 0.01% giant
+    else if (chance(10, r)) items *= 100;  // 0.1% huge
+    else items *= 10;                      // 1% large objects;
+  }
   if (items==40) items++;              // pthreads uses that size for stack increases
   uintptr_t* p = (uintptr_t*)mi_malloc(items*sizeof(uintptr_t));
   if (p != NULL) {