Are FastFlags allowed on Roblox?
FastFlags are allowed when they only change your own client, the ones that set your frame-rate target, pick a rendering backend, or switch an effect off. They are Roblox’s own client settings, written to a file on your machine before the game starts — nothing is injected into a running game. Over 2025–26 Roblox narrowed which locally-set flags the client still honours, so plenty of old flag lists no longer do anything. That is not a ban on tuning your client. Keep to flags that only change your own view and FastFlags remain a safe way to make Roblox run better.
This is why BetterStrap ships named presets for FastFlags FPS tuning and graphics FastFlags instead of a bare list of flag names. You get the tuning without hunting for entries Roblox may already have retired.
What changed in 2025–26
For years, bootstrappers let players set almost any internal client flag and have it take effect. Roblox has since tightened that: a flag name the client no longer recognises is quietly dropped, so the wild-west era of "set any FFlag you want" is ending. Roblox has never published which names still work, which is why a flag list copied from a two-year-old forum post is worth re-checking. The flags people actually rely on for frame rate and rendering have mostly kept working.
Which FastFlags are the safe ones
Client-only
- Frame-rate target (FPS)
- Rendering backend and anti-aliasing
- Switching off post-processing and 3D grass
- Quality overrides that only change your own view
Avoid
- Flag dumps pasted in bulk with no idea what each name does
- Anything that changes gameplay or other players
- Tools that inject into the running game instead of writing a settings file
- Flags shared to "unlock" hidden or restricted behaviour
The less fiddly approach
The cleanest way to benefit from FastFlags is to let a tool hold the names for you. Instead of hunting for flag names and hoping they still do something, use named controls that map onto known flags. That is how BetterStrap handles FPS and graphics: named presets and grouped controls, plus a check against Roblox’s live flag list so you can see at a glance which of your flags Roblox still serves.
