diff --git a/XCODE_6_UPGRADES_TODO.txt b/XCODE_6_UPGRADES_TODO.txt
index c682a09b2f4b8e6c1b231a2aaa7eaa82fccc770e..1330e339103b882b939ca6c2e4529a0dd75ddd3d 100644
--- a/XCODE_6_UPGRADES_TODO.txt
+++ b/XCODE_6_UPGRADES_TODO.txt
@@ -1,7 +1,12 @@
+
 * autobuild configure with tests on (LL_TESTS:BOOL=ON) and fix errors
 
 * Fix up commented out code in 'tut' package - tut/tut/tut_assert.hpp #82 & #84 (no operator << for T & Q), rebuild package and point autobuild.xml at original version
 
+* Release builds on initial inspection at least, run 1/3 the speed (frame rate meter) of same viewer-release build - clang optimization off?
+
+* Should we be using libstdc++ (GNU) or libc++ (clang) - using the former but latter is more 'clang'y
+
 * Investigates: https://bitbucket.org/callum_linden/viewer-tools-update-callum/commits/3d2fb85943d527e7db9908ff2824bc54afe916f1
 
 Weird folder name "build-darwin-i386/newview/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)/Second Life.app" - likely causes because those $() should be ${} for CMake? - No, it's something else - lots of occurences in build-darwin folder but where do they come from? ....