Esc don't work, lag problem

Hi, there is my problem, my keyboard have some bugs right now(i don’t know why) the key "Esc-8-F2-F3-Num lock and a lots of specific key don’t work, BUT the real problem is : I need to decrease the graphics of the game to play normally but i can’t, I have like 5-10 FPS, I can’t play nomally… Need your help, a possiblity to decrease the graphics without use the key “esc”?
Sorry for my bad english :slight_smile: