Why this list matters for performance
A game's lag profile depends on how many other players are in your server, not just your own hardware. Games with hundreds of thousands of concurrent players run larger, busier servers — more player models, more physics replication, more scripts running at once. That is a different problem from a slow GPU, and no Windows setting fixes it. See client lag vs. server lag for how to tell which one you are dealing with.
The games below rotate. Roblox's trending list changes week to week, sometimes faster — a game with 500,000 players this month can drop off within weeks, and something else takes its place. Numbers here are live for whichever games are currently tracked, not a fixed snapshot.
Genre-based tips, since specific games come and go
Instead of a separate guide for every game that trends, the tips below are matched to genre — because the causes of lag repeat across games of the same type, even as which specific game is popular changes.