iphone - App is fast on 3GS but slow on 3G -

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i'm new computer coding , have finished coding app , tested on both 3g , 3gs. on 3gs, worked normal on simulator. however, when tried run on 3g, app becomes extremely slow. i'm not sure what's reason , hope shed light on me.

generally, app has couple of view controller classes, 1 of them being title page, 1 being main page, 1 setting, etc. used dissolve transition title page main page. simple transition shows un-smooth performance on 3g! other part of app involves zooming in images scaling images, switching images push or dissolve upon receiving touch events, saving photos photo library , storing , retrieving photos in folder , data in sqlite database, each showing un-smooth actions.

compared heavy graphic or heavy maths app, think mine pretty simple. totally have no clue why app behave slow , un-smooth barely useful on 3g. help/ direction appreciated. helping out.

you might want try profiling application shark find out performance bottlenecks are.


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