It haven't been 2 years since your last spree on Sos nub h,
Windows 10 has issues with Gta vc, if you were playing it on windows 7,8, then switched to 10, you'll notice difference in the game's screen frames, even tho it shows 60 in /fps, it'll still be as if you're playing on 30 fps in your screen,
Solution 1 - type 'gamebar' in your search box, then disable it from the settings and regedit
Solution 2 - /setconfig game_streammem 4192
Solution 3 - change the game's compatibility settings to Windows 98