Speeding up image drawing

[Arbit Richardi]

I'm looking for tips to speed image drawing on OS X — this is a
primary function of my application. I started out naively with
NSImage, switched to CGImage, added layer backing, then drew directly
into that layer with Quartz. I have an implementation using
CATiledLayers but that doesn't add speed in most cases.

At this point, large images still draw significantly slower than in
Preview. For example, I can display a 25MB test image (~9k x 9k
pixels) in ~2 seconds while Preview can do it in ~1 second.

I've looked at Preview in Shark and can't make much of it. I've combed
the documentation, the internet, and the list archives pretty
thoroughly and I feel like I'm about out of things to try. Can anyone
on the list give me any leads or advice?

Thanks
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