set better default options for performance

src/memory.c

@@ -314,10 +314,10 @@ void _mi_mem_free(void* p, size_t size, size_t id, mi_stats_t* stats) {
     // reset: 10x slowdown on malloc-large, decommit: 17x slowdown on malloc-large
     if (!mi_option_is_enabled(mi_option_large_os_pages)) {
       if (mi_option_is_enabled(mi_option_eager_region_commit)) {
-        _mi_os_reset(p, size, stats);      // 10x slowdown on malloc-large
+        //_mi_os_reset(p, size, stats);      // 10x slowdown on malloc-large
       }
       else {      
-        _mi_os_decommit(p, size, stats);  // 17x slowdown on malloc-large
+        //_mi_os_decommit(p, size, stats);  // 17x slowdown on malloc-large
       }
     }