Sätt in detta i autoexec.cfg :

snd_obscured_gain_dB 0.0
mat_dxlevel 98
mat_parallaxmap 1
mat_bumpmap 1
mat_drawwater 1
mat_fastnobump 0
mat_filtertextures 1
mat_filterlightmaps 1
mat_mipmaptextures 1
mat_showlowresimage 0
mat_specular 1
mat_picmip -1
mat_parallaxmap 1
snd_mix_async 1
cl_forcepreload 1
r_threaded_particles 1
r_threaded_renderables 1
r_shadowrendertotexture 1
r_flashlightdepthtexture 1

Går att använda tsm med : https://www.moddb.com/mods/half-life-source-fixed/downloads/hls-fix