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.
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 instruments to spot the problem to no avail.
I couldn't solve the problem, so i took a totally different approach by using smaller layers.