gfx_maxfps 1
and gfx_limitfps 30
, but as long as you are not on battery 300 fps sounds fine. Don't go below the refresh rate of your monitor (60 in most cases), but in my opinion it's better to use a way higher value. The screen can't display more frames but it still lowers the input latency. Limiting makes sense when you go beyond 1000 fps or need to save power (edited)