Application fails to load inconsistently on iPhone 3G

I have two iPhone devices: 3G and 3GS. My application always loads successfully on iPhone 3GS but on iPhone 3G it loads like 10% of tries (but it loads). I do not have any exceptions or zombies.

C开发者_如何学运维an someone lead me to possible causes or suggestions to how can i find root cause of the problem?

There are many possibilities. One of them is the "Images". Are you using a lot of images? What are the resolution. Remember:

iPhone 4, ipod touch use XX@2x resolution (retina image: 640 x 960 px)

iPhone 3 without @2x (smaller resolution: 320 x 480 px)