diff -Nru zlib-1.2.8.dfsg/debian/changelog zlib-1.2.8.dfsg/debian/changelog
--- zlib-1.2.8.dfsg/debian/changelog	2013-05-03 16:00:51.000000000 +0000
+++ zlib-1.2.8.dfsg/debian/changelog	2014-06-05 14:06:31.000000000 +0000
@@ -1,3 +1,9 @@
+zlib (1:1.2.8.dfsg-1+rpi1) jessie-staging; urgency=medium
+
+  * Switch to O2 as 4.8 with O3 gives poor performance.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Thu, 05 Jun 2014 14:06:16 +0000
+
 zlib (1:1.2.8.dfsg-1) unstable; urgency=low
 
   * New upstream release.
diff -Nru zlib-1.2.8.dfsg/debian/rules zlib-1.2.8.dfsg/debian/rules
--- zlib-1.2.8.dfsg/debian/rules	2013-05-03 16:00:06.000000000 +0000
+++ zlib-1.2.8.dfsg/debian/rules	2014-06-05 14:06:09.000000000 +0000
@@ -31,7 +31,7 @@
 ifneq (,$(findstring noopt,$(DEB_BUILD_OPTIONS)))
 	CFLAGS += -O0
 else
-	CFLAGS += -O3
+	CFLAGS += -O2
 endif
 
 32-ARCHS=amd64 ppc64 kfreebsd-amd64 s390x