--- CMakeLists.txt.orig	2017-08-23 06:19:33.000000000 +1000
+++ CMakeLists.txt	2017-12-15 16:07:38.446002260 +1000
@@ -73,6 +73,11 @@
     set(ASAN_DEFAULT ON)
 endif()
 
+# ASAN causes uTox to be slower so do no use it for release builds
+if (CMAKE_BUILD_TYPE MATCHES "Release")
+   set(ASAN_DEFAULT OFF)
+endif()
+
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 # Options #
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