Help for config and retina issue

Games
#1

Hello, I am developing a game for both, iphone3 and retina display and my config is:

-- config.lua  
  
application =  
{  
 content =  
 {  
 fps = 60,  
 width = 320,  
 height = 480,  
 scale = "zoomStretch",  
 --scale = "Letterbox",  
 --scale = "none",  
 antialias = true,  
  
 imageSuffix =  
 {  
 ["@2x"] = 2,  
 },  
 },  
}

When I test the game on 3gs, no problem, it works perfect. But if I try it on iphone4, it lags a lot and character moves slower. I mean on 3gs character moves to somewhere in 1 sec but on iphone 4 it move in 2 secs, where am I doing wrong? I dont think I should get in main.lua that if its retina change character’s position x2 times? [import]uid: 80068 topic_id: 19462 reply_id: 319462[/import]