disappointing performance

I have an iMac with a 1.83Ghz core duo and an ATI X1600 (OSX 10.4). The performance is quite poor. Actually I have a Linux box with a P4 1.2Ghz and an NVidia 6800 and it's faster on there. I was expecting the iMac build to perform a bit better.

The performance seems to get worse over time, which can point to memory leaks (but well, that may not be the only explanation)

I also notice hitches when textures are bound. Teleporting to a new area, and the app will hitch for about a second for each new texture appearing on screen (untextured geometry is fine). I know on Linux some drivers do format conversion in your back on texture bind, and I suspect something similar on the Mac.

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Then search on iMac in the "mac Discussion" forum for further tips.
...and then wait for Leopard
Early reports are that Leopard will dramatically improve Open GL graphics, especially on macs with dual processors.