@tpo1990 This tutorial really works well for me on pi4 thanks! All graphics settings to max and still good performance on my small 1024x768 monitor. Looks great and runs between 30 - 60 fps
Game is harder than I expected or remember though!

Had trouble to begin with as game wouldn't fit on the screen at small resolution. Problem wasn't fixed with overscan settings, nor could I fix it with playing around with /opt/retropie/configs/ports/rtcw-sp/main/wolfconfig.cfg settings.
Could still tell what the mouse cursor was pointing at off screen thanks to the menu tool tips. Luckily managed to change resolution settings