i've always heard about GoldSrc Package problems with fps stability. i used to speedrun hl and bs about a year ago with minor fps problems but now i reinstalled bs and its working way worse, with lag spikes of ≈250 (normal fps) to 30fps every 3-10 seconds. is there any way i can improve the fps stability?

ps: i have "clockwindow 0"

Number of things can be wrong:

-Exclude goldsrc package folder from Anti-Virus software checking it

-CPU/GPU throttling from getting cooked, try HWMonitor to check your temps and lower your temps if need be