Lights on or off did not seem to change anything. The highest it got for me was 7 fps, but it usually sits at 5 fps while walking around.

Hey there did a play test and found that performance was about equal with the lights set on and off but was low at 7 fps, sometimes dipping to 5 fps. I believe these dips occur when enemies are not yet visible but nearby. The textures on walls parallel to the line of sight still appear to compress when looked at. 

the floor texture looks good though.