title: CALayer Resize is slow
body: <p>I am having some performance issues with some code that I have written for resizing a CALayer using touch. It works fine but the animation is far from snappy enough and lags behind the touch location.</p>
  
  <pre><code>CGPoint startPoint;
  CALayer *select;
  
  - (CGRect)rectPoint:(CGPoint)p1 toPoint:(CGPoint)p2 {
       CGFloat x, y, w, h;
       if (p1.x &lt; p2.x) {
           x = p1.x;
           w = p2.x - p1.x;
       } else {
           x = p2.x;
           w = p1.x - p2.x;
       }
       if (p1.y &lt; p2.y) {
           y = p1.y;
           h = p2.y - p1.y;
       } else {
           y = p2.y;
           h = p1.y - p2.y;
       }
       return CGRectMake(x, y, w, h);
   }
  
   - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
       UITouch *t1 = [[[event allTouches]allObjects]objectAtIndex:0];
       CGPoint loc = [t1 locationInView:self];
       startPoint = loc;
       lastPoint = CGPointMake(loc.x + 5, loc.y + 5);
  
       select = [CALayer layer];
       select.backgroundColor = [[UIColor blackColor]CGColor];
       select.frame = CGRectMake(startPoint.x, startPoint.y, 5, 5);
       [self.layer addSublayer:select];
   }
  
   - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
       UITouch *t1 = [[[event allTouches]allObjects]objectAtIndex:0];
       CGPoint loc = [t1 locationInView:self];
       select.bounds = [self rectPoint:startPoint toPoint:loc]; 
   }
  </code></pre>
  
  <p>Is there a better way of achieving this?</p>