Open steam and find the Team Fortress 2 game, right click it and and click properties and launch options, now type
-dxlevel 81
This will raise the framerate dramatically without any noticeable change to the graphics. c:
If you're getting extremely desperate for FPS, make it 80.
EDIT:
http://steamcommunity.com/id/PowerFusionX/ Just in case you might like me.
DOUBLE EDIT: You can check your framerate by opening the console and typing
net_graph 1
and turn it off by changing the 1 to 0.
and I can run it btw.