just try simply apply quality preset “low”, then, after ETQW restart[after request form ETQW], tweak it a bit, like add “2” to r_useThreadedRenderer cvar or ensure both “com_unlockFPS” and “com_unlock_timing_method” cvars was set to “1” and “2” respectively.
p.s.
dont use “0” timing metod in online gameplay.
this only increase you ping/lag and CPU saturation on level above acceptable for [transparent]ETQW netflow, cuz ETQW still send data on 30Hz/30FPSx times, whatever in appear on screen with “0” value, just try[with less than moderate success and horrific spatial artefacts ingame] to interpolate it both client-side and server-side.
p.p.s.
hardly not like ETQW without GFX beauties, available at r_megadrawmethod at “0” and some other tweaks like “image_usecompression” at “0” and “image_detaillevel” at “0”[against default 0.7"]as well as famous increase for viewdistannce by putting to “1.2” r_visDistMult cvar.
that, with help of AF16x and [especially]trilinear filtering[turn OFF optimisations in you GFX drivers. regardless GFX vendor you use] can make my heart beat louder sometimes[ingame].