Index: jchuff.c
===================================================================
--- jchuff.c.orig	2012-06-30 01:52:08.000000000 +0200
+++ jchuff.c	2014-11-24 13:52:20.214638106 +0100
@@ -392,7 +392,7 @@
 #endif
 
 
-#define BUFSIZE (DCTSIZE2 * 2)
+#define BUFSIZE (DCTSIZE2 * 4)
 
 #define LOAD_BUFFER() { \
   if (state->free_in_buffer < BUFSIZE) { \