Movement lag in TileMap during swipe

Movement lag in TileMap during swipe
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I am developing a game with an isometric tilemap (44x44 size). I have trouble with moving the map during a swipe on the iPad-1, but it runs fine on an iPad-2. Moving the map is not smooth even if there is only the map without sprites.
I use easeout action to give retarded motion .

_tileMap->runAction(CCEaseOut::create(CCMoveTo::create(time, bottomLeft),2))

Problem remain even i simply use moveto action.
I tried 2d projection and turned off subpixel rendering (in ccConfig.h). But no help at all.

Please Help………Thanks in advance