Memory不足問題
--> 3G (128M) 經iOS4.X
a.有開multitasking --> drop to 15-25M (一定lag且容易當機)
b.沒開multitasking ---> drop to 20-30M (同上)
使用VM,只是讓你機子當更快,當OS用到memory address時,阿婆一定先保護OS,只好當機

而3GS (256M)經iOS4.X,drop to 110M-150M會比較順

Iphone4 (512M)經iOS4.X,drop to 220M-300M

阿婆告訴你要該換機