Fast Flags : Improve FPS, Lower Ping & Official Allowlist

What Are Fast Flags? Why Are They Used

Fast flags which are known as FFlags list are hidden internal settings used to control graphics, networking behavior and experimental features without modifying original game files. These settings are managed by Roblox itself, so it is safe to use but Roblox gives an allowed list of fast flags. Fast flags codes can be used to boost performance and to explore some hidden settings.

How Fast Flags Work?

They work through modifying client settings when you are using Voidstrap. These settings are injected into Roblox startup configuration, which is applied immediately and gives the desired results. There are different FFlags available for different functionalities; we discuss them one by one.

Fast Flags Fps Boost

Every gamer wants better FPS, and they have tried to uncap FPS through different methods to unlock FPS. They can help you; here are different fast flags that can help you get unlimited FPS, which are unbannable.

{
"FFlagDisablePostFx": true,
"FFlagDisableShadows": true,
"FFlagDisableBloom": true,
"FFlagDisableDepthOfField": true,
"FFlagDisableGlobalShadows": true,
"DFIntTaskSchedulerTargetFps": 240
}

{ "DFIntTaskSchedulerTargetFps": "9999" }

Smoother Gameplay & Reduced Stutter

To make the game smooth and reduce lag, these fast flags can be applied. These not only reduce latency but also improve performance.

{
"FFlagEnableReducedLatency": true,
"FFlagFastGPULightCulling3": true,
"FFlagRenderFixFog": true,
"FFlagRenderOptimizedShadows": true
}

CPU & Memory Optimization

CPU and RAM play a crucial role in FPS improvement and network stability, so CPU and memory optimization gives you the best possible smoother gameplay. Enabling low memory optimizes the game for low memory PCs hence the game graphic quality is reduced, but the playing quality increases.

{
"DFIntPhysicsStepsPerFrame": 1,
"DFIntGCJobFrequencyMs": 250,
"FFlagLuaAppEnableLowMemoryMode": true
}

Recommended Balanced Preset

Here is the recommended list which I made for balanced performance. This list of fast flags improves the performance of the game without compromising the game quality.

{
"DFIntTaskSchedulerTargetFps": 144,
"FFlagDisablePostFx": true,
"FFlagDisableBloom": true,
"FFlagEnableReducedLatency": true,
"DFIntConnectionMTUSize": 1400
}

Display FPS

{ "FFlagDebugDisplayFPS": "True" }

Fast Flags For Low Ping

Low ping or high latency can ruin your gaming experience. For low latency, network stability is most important. These are the top fast flags that can be used to stabilize the network, give you better ping, and improve your gaming. you can also get low ping by selecting best server through server browser

Lower Ping & Network Stability

{
"DFIntConnectionMTUSize": 1400,
"DFIntRakNetResendBufferArrayLength": 128,
"DFIntRakNetResendTimeoutMS": 300,
"DFIntNetworkPrediction": 1,
"DFIntNetworkLatencyTolerance": 1
}

Ultra Low Latency Preset

These presets can be used for network stabilization. For ultra-low ping, please use that list and apply all.

{
"DFIntConnectionMTUSize": 1380,
"DFIntRakNetResendTimeoutMS": 200,
"DFIntRakNetResendBufferArrayLength": 64,
"DFIntNetworkPrediction": 0,
"DFIntNetworkLatencyTolerance": 0
}

Whitelisted Fast Flags

From older times, some gamers were manipulating gameplay by using fast flags to make the game more fair. Roblox introduced a system called Fast Flags Allowlist, which restricts fast flags from being used for cheating/abuse.

Fast Flags Allowlist is given below, which can be used without fear of a ban

Geometry

By adjusting these values, the client can determine how far away objects switch between high and low detail, which can help improve performance and reduce rendering lag.
They are especially useful for optimizing large or complex maps while keeping gameplay smooth.

DFIntCSGLevelOfDetailSwitchingDistance
DFIntCSGLevelOfDetailSwitchingDistanceL12
DFIntCSGLevelOfDetailSwitchingDistanceL23
DFIntCSGLevelOfDetailSwitchingDistanceL34

Rendering

These Fast Flags control graphics rendering, texture quality, anti-aliasing, and fullscreen behavior in Roblox.
They can be used to optimize performance, adjust visual fidelity, and improve stability on different hardware setups

FFlagHandleAltEnterFullscreenManually

DFFlagTextureQualityOverrideEnabled

DFIntTextureQualityOverride

FIntDebugForceMSAASamples

DFFlagDisableDPIScale

FFlagDebugGraphicsPreferD3D11

FFlagDebugSkyGray

DFFlagDebugPauseVoxelizer

DFIntDebugFRMQualityLevelOverride

FIntFRMMaxGrassDistance

FIntFRMMinGrassDistance

FFlagDebugGraphicsPreferVulkan

FFlagDebugGraphicsPreferOpenGL

How To Apply Fast Flags?

1. To use fast flags, you must have a bootstrapper like Voidstrap.
2. Launch the bootstrapper from your PC.
3. Navigate to the fast flag editor and click on the Add New button.
4. Now carefully copy and paste the desired fast flag in the Value section and add a Name for remembering which code you are adding for the future. Click OK to add it to your list.

5. Click on the Save option to successfully add the fast flags to your game