I also discovered that --fps_test=3 produces unreliable results because...wait for it...the deer and birds are randomized. If they show up during the fps test, you get hit with a performance penalty. I am working to correct this and may have to recut the time demo to work around this behavior.
If you are trying to time the sim via --fps_test=3, I suggest running the test multiple times - you should see "fast" runs and "slow" runs depending on our feathered and four-legged friends.
Phoronix reported a performance penalty with the new update; I do not know the cause of this or whether the fps_test=3 bug could be causing it. But their test setup is very different than mine - a GeForce 9400 on a big screen, which really tests shading power. My setup (an 8800 on a small screen) tests vertex throughput, since that has been my main concern with NV drivers.
My suggestion is to use --fps_test=2 if you want to differential 10.6.2 vs. 10.6.3. I'll try to run some additional bench-marks soon!
EDIT: Follow-up. I set the X-Plane 945 time demo to 2560 x 1024, 16x FSAA, and all shaders on (e.g. let's use some fill rate). I put the Cirrus jet on runway 8 at LOWI, then set paused forward full screen no HUD. In this configuration, I see these results:
Objects 10.5.8 10.6.3Note that in the "no objects" case the sim is fill-rate bound - in the other two it is vertex bound. So it looks to me like 10.6.3 is faster than 10.5.8 for both CPU use/object throughput and perhaps fill rate (or at least, fill-rate heavy cases don't appear to be worse).
none 85 fps 100 fps
a lot 46 fps 61 fps
tons 37 fps 42 fps
* These extensions represent Apple and the graphics card company creating software interface to fully unlock the graphics card's abilities.
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