title: small delays/pause in animation
body: <p>Hi all can anyone help me out with the solution to this problem...</p>
  
  <p>I have a project where I have NSTimer fire about 20 times a sec and thus using only one image(loaded programatically)produces the same image on the iPhone screen about twenty times in a second and these images fall from the top of the screen to the bottom where they are removed(more or less simulating rain fall or rain droplets). </p>
  
  <p>My problem is that looking at the animation, I noticed that there are very small delays and which looks like a break, pause or small vibrations. Thus the flow isn't smooth.  </p>
  
  <p>Can anyone help me with the solution please.</p>
  
  <p>Thanks in advance</p>