Chalk me up as another suffering from halved framerates and random chop.
I've updated to the latest drivers and cleared out my shader cache. I've even installed Cuban's CCC pack to try and reclaim a few FPS.
The mod is playable with 20 players or fewer, but anything more and performance starts to head south.
I'll fire up Fraps and post some hard numbers later.
GTX 280
Core 2 Quad Q9450
4GB DDR2
Vista 64bit
UPDATE:
Ok so I fire up Fraps and pulled some benchmarks. Played one game on a server of 16 players. Map was Thunder_Rift.
Apparently I managed a min/max of 1/99 somehow and averaged out at 37.65 FPS over the course of a single game. Now that in itself isn't so bad, if it were at all consistent, but it's anything but. The framerate frequently dips as low as 12-20 FPS when the action gets hot, which is quite a hit to my average.
I manage some nice highs of 60-80 indoors, but that's to be expected. When I'm just cruising around from A to B, it generally doesn't dip below 45. But you'd expect the framerate to drop by 10, maybe 15 fps at the most when it all kicks off. Instead, I end up losing more like 20-25 FPS, with the the occasional uber-stutter thrown in for good measure.
I'm running in DX10 mode, and naturally I've tried DX9, but haven't noticed much difference. I think, if anything, DX9 may be offering inferior performance. Strange.
Now granted I never benchmarked previous versions of the mod, so I don't have a strong basis for a comparison. Is this release just that much more demanding?