ios - CABasicAnimation の遅延 (iOS5)

Question

iOS 6 で完璧に動作する単純なアニメーションをいくつか取得しましたが、iOS5 では遅延が発生し、理由もなく画面がフリーズすることがよくあります

ここで何が間違っているのかまったくわからないので、本当に助けが必要です。ちなみに、各アニメーションをオフにしようとしましたが、問題は「変換」アニメーションにあるようです

コードは次のとおりです。

-(void)drawDotAtPointAnimated:(CGPoint)p withRadius:(CGFloat)radius andColor:(UIColor *)color
{
CGRect circleFrame = CGRectMake(p.x - radius*self.scale, p.y - radius*self.scale, radius*2*self.scale, radius*2*self.scale);
CGPoint circleAnchor = CGPointMake(0.5, 0.5);

NSLog(@"animating dot with x = %f and y = %f", p.x, p.y);
NSLog(@"=====mid x = %f, mid y = %f", CGRectGetMidX(circleFrame), CGRectGetMidY(circleFrame));
NSLog(@"=====max x = %f, max y = %f", CGRectGetMaxX(circleFrame), CGRectGetMaxY(circleFrame));

self.shapeLayer = [CAShapeLayer layer];
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, circleFrame.size.width, circleFrame.size.height)];
self.shapeLayer.path = path.CGPath;
self.shapeLayer.anchorPoint = circleAnchor;
self.shapeLayer.frame = circleFrame;
self.shapeLayer.fillColor = color.CGColor;

[self.layer addSublayer:self.shapeLayer];

CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform"];
animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.0, 0.0, 0)];
animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(4.0, 4.0, 1.0)];
if(self.mode == GameModeOffline) {
    animation.repeatCount = OFFLINE_GAME_DOT_ANIMATION_REPEAT_COUNT;
} else {
    animation.repeatCount = ONLINE_GAME_DOT_ANIMATION_REPEAT_COUNT;
}
animation.duration = 1;
animation.delegate = self;
[self.shapeLayer addAnimation:animation forKey:@"transform"];

CABasicAnimation* fadeAnim = [CABasicAnimation animationWithKeyPath:@"opacity"];
fadeAnim.fromValue = [NSNumber numberWithFloat:1.0];
fadeAnim.toValue = [NSNumber numberWithFloat:0.0];
fadeAnim.duration = 1.0;
if(self.mode == GameModeOffline) {
    fadeAnim.repeatCount = OFFLINE_GAME_DOT_ANIMATION_REPEAT_COUNT;
} else {
    fadeAnim.repeatCount = ONLINE_GAME_DOT_ANIMATION_REPEAT_COUNT;
}
[self.shapeLayer addAnimation:fadeAnim forKey:@"opacity"];

self.shapeLayer.transform = CATransform3DMakeScale(4.0, 4.0, 1);
self.shapeLayer.opacity = 0.0;

任意の助けをいただければ幸いです