Hey guys just wanted to show this off, a video I made earlier and it took a couple hours to upload thanks to DSL 
anyway, gameplay video of the new DLC and I comment on FPS throughout as I have the fps counter up (net_graph 1) anyway enjoy!
OSX 10.6.4
2.4ghz
320m
4gb ram
Left 4 Dead 2 gameplay on MBP native osx
ran average of 40-50 fps, dropped to 29-30 at the tank "scene" but hovered at least 40+ almost all the time else up to 60; game settings in video; shaders medium, effect low, model medium, no AA, native res 1280x800, no vsync, AF trilinear etc etc
anyway, gameplay video of the new DLC and I comment on FPS throughout as I have the fps counter up (net_graph 1) anyway enjoy!
OSX 10.6.4
2.4ghz
320m
4gb ram
Left 4 Dead 2 gameplay on MBP native osx
ran average of 40-50 fps, dropped to 29-30 at the tank "scene" but hovered at least 40+ almost all the time else up to 60; game settings in video; shaders medium, effect low, model medium, no AA, native res 1280x800, no vsync, AF trilinear etc etc