Do forgive me if I’m wrong in some parts; I tried to do all the research, but I might’ve missed a few parts.
SUMMARY:
- FPS unlockers are allowed, but some may be broken due to a recent Roblox patch in late september that removed access to changing most of the client app setting flags.
- Lag switching, by definition, is cheating/exploiting, as stated in the Community Standards. If you do go through with it regardless, avoid gaining an unfair advantage/affecting the gameplay of other players to avoid getting into trouble.
FPS Unlockers
When it comes to using external FPS unlockers, yes, they are allowed, but use trusted ones (e.g. Bloxstrap). Avoid installing malware if using lesser-known ones, and make sure you get unlockers from their official websites.
However, recently, Roblox changed how these external clients work through an update to patch exploits. This is the post that announces the release of Roblox’s official FPS unlocker. In it, it states that:
These “flags” mentioned let you change the client app settings locally (meaning you won’t get in trouble for using them). However, Roblox recently removed access to most flags, and now run on an “allowlist” system, which was due to the flags being used for exploiting the physics engine. As such, some FPS unlockers might be broken/outdated and may need updating. I’d advise you go check the article yourself.
Lag Switching
When it comes to lag switching, I’d probably avoid using them, since intentionally disrupting your network for an advantage is considered cheating in Roblox’s Community Standards (see below):
While I’m sure it’s probably fine if you’re keeping the difference low/if you’re using it to affect yourself only, it might trigger Roblox’s automated moderation systems (or if it affects other players, owners of the games may ban you from them; check their in-game rules first).