Use large textField slowed considerably the aplication.

I have many problems with SPTextField.
Once the text is too big, it becomes very slow on the tablet. For cons, I have no problem on the simulator.

ex : imageTextePerso=[[SPTextField alloc] initWithWidth:200 height:100 text:informationPerso fontName:@"Copperplate" fontSize:7 color:0xffffff]

Is there an other way to present text in a game?

Try no to use a True Type font

Exactly! Bitmap Fonts are much faster to render, and take up less memory in most situations.