I'm trying to optimize the memory usage on the launch of one of my game (Blockoban) because it causes memory crashes for some players.
Playing the game in instruments I have this memory profile on launch.

http://screencast.com/t/qlV1jArAm7
The top of the curve is when I load a 1024x1024 texture and I guess this is where the game crashes. I've tried to load a png, a pvr, and there is always this small memory usage burst (a bit lower with a pvr). Is there a way to avoid this? I thought that pvr would be added directly into memory but it's not the case.
(cocos2d v0.99.5-beta3)