title: CaLayer performance with animating pie chart
body: <p>I've developed a Pie Chart with animating pie segments. Each segment s a sublayer with custom drawing. The start and end angles are dynamic properties. The parts and their labels are drawn with core gaphics.</p>
  
  <p>However, i notice bad performance with lots of red layers in the simulator. I cannot you opaque layers with pie parts obviously. i've set the ShouldRasterize to yes, that helped a bit. I also tried using <code>instruments</code> to spot the problem to no avail.</p>