I used to run the game 60-100 fps consistently, but with the latest patch I'm getting around 16-40 fps.
It gets really bad even in small 6 man games.
Whenever someone spawns, heals, uses flare/fire/poison arrows or lightning magic the framerate drops like a rock.
Several of my friends are getting the same fps loss with the new patch, we've tried reinstalling, running with default configs, and tweaking everything to the lowest possible settings using console commands. We have a wide range of systems so it can't be our computers.
I'm running an AMD 4000+, 2gigs ram, ATIx800 pro, audigy 2 zs with the latest drivers /directx.