--- glibc-2.24/malloc/malloc.c~	2016-11-13 22:53:14.000000000 +0000
+++ glibc-2.24/malloc/malloc.c	2016-11-13 23:01:29.750884186 +0000
@@ -858,7 +858,7 @@
 #define M_TRIM_THRESHOLD       -1
 
 #ifndef DEFAULT_TRIM_THRESHOLD
-#define DEFAULT_TRIM_THRESHOLD (128 * 1024)
+#define DEFAULT_TRIM_THRESHOLD (512 * 1024)
 #endif
 
 /*
@@ -891,7 +891,7 @@
 #define M_TOP_PAD              -2
 
 #ifndef DEFAULT_TOP_PAD
-#define DEFAULT_TOP_PAD        (0)
+#define DEFAULT_TOP_PAD        (64 * 1024)
 #endif
 
 /*