How to Get Max FPS with Fleasion (FastFlags)

Fleasion isn't only for custom sounds and skins — we also built a Modifications tab that exposes Roblox FastFlags, so you can uncap your FPS, drop texture and mesh quality to the floor, switch rendering mode, and more, for a faster, flatter, competitive-friendly game. There's one catch that trips people up, and we'll flag it early: if you also run a bootstrapper like Bloxstrap or Voidstrap with FastFlags on, the two fight each other. Below we go through every performance setting and how to avoid that clash. New to the tool? See how to use Fleasion.

What FastFlags are, and where we put them

FastFlags are internal Roblox client settings that control how the engine renders and performs. They're normally hidden, but tools can toggle them. In Fleasion they live in the Modifications tab of the Dashboard — this is our own FastFlag system, separate from any launcher you use.

To reach them: open Dashboard → Modifications, then turn on Enable FastFlags. Once it's on, the performance options below open up.

First: turn off your bootstrapper's FastFlags

This is the step that makes or breaks it. If you run a bootstrapper — Bloxstrap, Voidstrap, or similar — and it has its own FastFlags enabled, those conflict with ours. You'll get settings that seem to do nothing, or fight each other.

So, first: turn off the FastFlags in your bootstrapper. Then enable FastFlags in Fleasion. Use one FastFlag source, not two. (Not sure how we differ from those launchers? See Fleasion vs Bloxstrap/Voidstrap.)

Enabling FastFlags in Fleasion

1. Open Dashboard → Modifications.
2. Toggle Enable FastFlags on.
3. Set the options you want (below).
4. Launch Roblox through Fleasion (the Roblox Player button). The flags apply on launch.

The settings that matter

Frame rate cap — uncap your FPS

By default Roblox caps your frame rate. Set the frame rate cap high — a lot of players use 999 — to effectively uncap it and let your hardware run flat out. This is the single biggest FPS win.

Texture & mesh quality

• Texture quality: 0 gives the flattest, fastest textures (and pairs well with a no-textures removal for an even cleaner look).
• Mesh quality: 0 simplifies meshes for more frames.

Lower quality here trades detail for performance and visibility — exactly what competitive players want.

Rendering mode & MSAA

• Rendering mode lets you pick how Roblox renders; try the options to see what runs best on your GPU.
• MSAA level controls anti-aliasing. Lower it (or off) for more FPS; raise it for smoother edges.

Gray sky

The gray sky option flattens the sky to plain gray. Some players use it for a distraction-free, high-contrast view (an alternative to a no-skybox removal).

Resolution / graphics scaling

If your screen looks stretched or scaled wrong, the resolution/graphics scaling option fixes it. Lowering render scale is also a strong FPS lever on weaker PCs.

Which settings move the needle most

Not all of these matter equally, so if you only touch a few, touch these. Rough order of FPS impact, biggest first:

The honest takeaway: the frame-rate cap and dropping quality to 0 do most of the heavy lifting. Fleasion's asset removals clean up your view and shave a little load, but they aren't where the big frames come from — that's the FastFlags above.

Don't set the frame rate in Roblox's own settings

Once you've uncapped FPS via our frame cap, leave Roblox's in-game "Maximum Frame Rate" setting alone. You already have max FPS from Fleasion; changing it in Roblox's own graphics menu can override or conflict with what you set. Just load in and play.

Stack it with removals for the cleanest, fastest game

FastFlags pair naturally with removals. A popular high-FPS, high-clarity setup:

• Frame cap 999 + texture quality 0 + mesh quality 0 (FastFlags)
• No textures + no arms + no skybox (Remove profiles — see no arms / no textures)

Together they give a flat, unobstructed, high-frame-rate view that's popular in competitive shooters.

Troubleshooting FastFlags & FPS

• FastFlags do nothing → your bootstrapper's FastFlags are still on and conflicting. Turn them off, keep only ours.
• FPS is still capped → you didn't raise the frame rate cap (try 999), or Roblox's own "Maximum Frame Rate" is overriding it — leave that at default.
• The screen looks stretched → adjust the resolution/graphics scaling option.
• Nothing applied → make sure "Enable FastFlags" is on, then relaunch Roblox through Fleasion. See the install guide if Roblox won't launch.

Frequently asked questions

How do I get max FPS with Fleasion? Open Dashboard → Modifications, enable FastFlags, and raise the frame rate cap (e.g. 999). Drop texture and mesh quality to 0 and lower MSAA for more frames, then launch Roblox through Fleasion.

My Fleasion FastFlags aren't working — why? You're probably running a bootstrapper (Bloxstrap/Voidstrap) with its own FastFlags on, which conflicts. Turn off the bootstrapper's FastFlags and use only ours.

Should I also set the frame rate in Roblox's settings? No. Once you've uncapped FPS in Fleasion, leave Roblox's own "Maximum Frame Rate" at default — changing it can override or conflict with your setting.

What does the gray sky option do? It flattens the sky to plain gray for a clean, high-contrast, distraction-free view. It's an alternative to removing the skybox.

Can I combine FastFlags with no textures and no arms? Yes — that's the classic minimal, high-FPS setup: frame cap 999 + texture/mesh quality 0, plus no-textures, no-arms and no-skybox removals.

Updated July 2026 — added a ranked breakdown of which settings actually move your FPS the most.

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Related: How to use Fleasion · Fast flags explained · No arms / no textures · Custom skyboxes (no skybox) · What is Fleasion vs Voidstrap