Bloxstrap Engine & FastFlags

Configure Roblox engine parameters through ClientAppSettings.json: framerate target, Direct3D 11 vs Vulkan, MSAA, and Voxel/Future lighting. Tuning official Roblox engine FastFlags safely through the Bloxstrap GUI and FastFlag Editor before the client starts.

Bloxstrap is a drop-in replacement only for the Roblox bootstrapper — it downloads, configures, and starts the official signed `RobloxPlayerBeta.exe` client without ever injecting DLLs or tampering with game memory.

Get the latest Windows installer from /download or explore the configuration guides below.

• **Persistent Mods:** Custom death sounds, cursors, and fonts inside Mods survive Wednesday Roblox updates automatically.
• **Discord Rich Presence:** Show the exact experience you are playing and let friends join your server directly through Discord RPC.
• **GUI Engine & FastFlag Controls:** Adjust framerate caps, Direct3D 11 / Vulkan rendering, and lighting modes under Engine.

• Framerate Limit / FPS Unlocker (DFIntTaskSchedulerTargetFps) — Sets the native Roblox task scheduler framerate ceiling without external DLL injection or memory tampering. Underlying key: DFIntTaskSchedulerTargetFps.
• Best Settings: Framerate Limit / FPS Unlocker (DFIntTaskSchedulerTargetFps) — How to tune Framerate Limit / FPS Unlocker (DFIntTaskSchedulerTargetFps) (144, 165, 240, 360, or 0 / 9999 (unbounded)) for lower input latency and stable frame times on Windows.
• Rendering Mode (Direct3D 11, Direct3D 10, Vulkan, OpenGL) — Switches the graphics API used by RobloxPlayerBeta.exe to lower CPU driver overhead or fix GPU driver crashes. Underlying key: FFlagDebugGraphicsPreferD3D11 / PreferVulkan.
• Best Settings: Rendering Mode (Direct3D 11, Direct3D 10, Vulkan, OpenGL) — How to tune Rendering Mode (Direct3D 11, Direct3D 10, Vulkan, OpenGL) (Direct3D 11 (default), Vulkan, Direct3D 10, OpenGL) for lower input latency and stable frame times on Windows.
• Preferred Lighting Technology (Voxel, ShadowMap, Future) — Forces lightweight Voxel lighting for huge FPS gains on integrated graphics or enables Future specular lighting for screenshots. Underlying key: DFFlagDebugRenderForceTechnologyVoxel / FutureIsBrightPhase3.
• Best Settings: Preferred Lighting Technology (Voxel, ShadowMap, Future) — How to tune Preferred Lighting Technology (Voxel, ShadowMap, Future) (Chosen by game, Voxel (Phase 1), ShadowMap (Phase 2), Future (Phase 3)) for lower input latency and stable frame times on Windows.
• Anti-Aliasing Quality (FIntDebugForceMSAASamples) — Locks Multisample Anti-Aliasing sample count to eliminate jagged brick edges or disable MSAA for maximum competitive frame rates. Underlying key: FIntDebugForceMSAASamples.
• Best Settings: Anti-Aliasing Quality (FIntDebugForceMSAASamples) — How to tune Anti-Aliasing Quality (FIntDebugForceMSAASamples) (Automatic, 1x (Off), 2x, 4x) for lower input latency and stable frame times on Windows.
• Disable Player Shadows & Post-Processing Effects — Turns off dynamic character shadows and bloom/depth-of-field blur to boost visibility and 1% low frame times. Underlying key: FIntRenderShadowIntensity / FFlagDisablePostFx.
• Best Settings: Disable Player Shadows & Post-Processing Effects — How to tune Disable Player Shadows & Post-Processing Effects (ShadowIntensity = 0, DisablePostFx = True) for lower input latency and stable frame times on Windows.
• Texture Quality & Mipmap Override (DFIntTextureQualityOverride) — Decouples texture sharpness from the single 1–21 Roblox in-game graphics slider so you can keep crisp textures at low render distance. Underlying key: DFIntTextureQualityOverride / FFlagDebugTextureManagerSkipMips.
• Best Settings: Texture Quality & Mipmap Override (DFIntTextureQualityOverride) — How to tune Texture Quality & Mipmap Override (DFIntTextureQualityOverride) (Level 0 (Lowest) to Level 3 (Highest)) for lower input latency and stable frame times on Windows.
• Disable DPI Scaling (Fix Blurry 125% / 150% Windows Display) — Renders the Roblox viewport and UI at native 1:1 monitor pixels on 1440p and 4K laptops using Windows 125% or 150% scaling. Underlying key: FFlagDisableDPIScale.
• Best Settings: Disable DPI Scaling (Fix Blurry 125% / 150% Windows Display) — How to tune Disable DPI Scaling (Fix Blurry 125% / 150% Windows Display) (True / False) for lower input latency and stable frame times on Windows.