Game optimization for weak PCs (The Witcher 3: Wild Hunt)

The other day I bought the Witcher at a ng discount and there is a problem, it turns out my PC doesn’t want to drag it even at minimum wages, I found the config on this site https://www.playground.ru/witcher_3_wild_hunt/file/witcher_3_optimizatsiya_dlya_ochen_ochen_slabyh_pk-1047972, but when entering the game the settings are reset to those by default, the "Read Only" checkbox is in the config, how to solve this and are there any other ways to increase the fps in this game?