Open your "etqwconfig" file in your Documents. Add these commands, if they aren't already present (if they are already there, just edit them):
com_unlockFPS "1" - this is the master cvar. If you do not set this to 1 then ETQW will never attempt to exceed 30fps.
com_unlock_timingMethod "0" - this removes the timing restriction which is otherwise set to multiples of 30. Ie; otherwise if you can't get 60fps, it will run at 30. With the timing method turned off I'm now usually getting between 70 and 120fps on high detail.
If you don't like dropping from 200fps down to 50fps during intense battles and prefer something more consistant:
com_unlock_maxFPS "90" - this will make your maximum FPS 90 but ONLY if you change the timing mode to 1 instead of 0. The problem here is that if you can't pull 90fps, it will automatically bounce back to 60 (even if you can render 85fps fine).