You are trying to play with a hd4000? looool....Better get yourself a real graphiccard... and then have Fun!
Otherwise you could try to decrease the resolution (1920*1080 is way to high for hd4000), switch off AA and all other unnecessary features... then you'll get an acceptable FPS (...maybe)...
Btw TF2 isn't an undemanding game
Greetings from Switzerland
Oliver