Use a pool to spawn images

Hi every one here is my code:

-(void) createNewImage {





[imageView setCenter:[self randomPointSquare]];

[[self view] addSubview:imageView];



[views addObject:imageView];

[imageView release];



ix=imageView.center.x;

iy=imageView.center.y;

[XArray addObject:[NSNumber numberWithFloat:(240 - ix)/diviseurVitesse]];

[YArray addObject:[NSNumber numberWithFloat:(160 - iy)/diviseurVitesse]];

}

-(void)moveTheImage{

    for (NSUInteger i = 0; i < [views count]; i++) {

    imageView = [views objectAtIndex:i];

    X = [[XArray objectAtIndex:i] floatValue];

    Y = [[YArray objectAtIndex:i] floatValue];

imageView.center=CGPointMake(imageView.center.x + X, imageView.center.y + Y);

} With this code, image are created and move to the center of the screen but after some seconds the performance decrease and come to 30fps. I would like to keep fps at 60 but I don't know how to proceed.Some people say that I can use pool but it's hard for me to use it because I don't really know how to use it :/ sorry for my english I'm french :/