https://store.steampowered.com/app/993090/Lossless_Scaling/

Costs $6 bucks but I found it to be worth a try. IIRC there’s a free alternative now but that was after I bought it.

It uses ‘frame generation’ to essentially make more frames at the cost of slight delay. Tbh I can’t notice it but others say they can. It can also do scaling but you can just it at native if you want.

I found it to be useful in games where you’re not directly controlling the character (FPS games). I use it for Kenshi as that games pretty unoptimized and doesn’t need fast reaction time. Also Minecraft just because Minecraft just really needs antialising.