i have windows 10 60 hz monitor please help

wdym "improve fps"? you mean your fps is locked on 60?

if so, go to your graphics card settings, and disable Vsync

gl_vsync 0 maybe

change rendering mode from Opengl to "software rendering"

I used to have serious problems with an old pc (still do sadly) where one day, after some windows update, all my opengl-type games just stopped working or became really slow.

Halflife contains the blessing of a "software rendering" mode so you dont even need opengl (i dont think), thats what worked for my lag anyway

make the game high priority

Download this repack https://bit.ly/rammys_2020_repack And set the gamma to darker

Open Console with ~ (or œ on Linux French keyboards)

fps_overide 1

fps_max 100

Set the game to OpenGL

Cheers !