Roblox FastFlag: FIntRenderGrassDetailLimits
Setting to 0 eliminates procedural grass rendering entirely, gaining up to 15 FPS in foliage-heavy games (Fisch, Deepwoken).
Roblox FastFlag FIntRenderGrassDetailLimits is an internal FInt engine configuration parameter audited by Telemetry Lab. Its official 2026 allowlist status is VERIFIED_WHITELISTED, with a factory default value of "100" and a recommended performance value of "0".
| Telemetry Metric | Verified Value |
|---|---|
| FastFlag Name | FIntRenderGrassDetailLimits |
| Data Type | FInt |
| 2026 Allowlist Verification | VERIFIED_WHITELISTED |
| Engine Subsystem Category | Performance & FPS |
| Engine Default Value | 100 |
| Recommended Value | 0 |
| Safety Risk Level | Safe |
| Tested Production Build | version-9ac8595712b447a7 |
Ready-to-Use ClientAppSettings.json Configuration
Copy this exact JSON snippet directly into your local Roblox ClientSettings folder or import it into Bloxstrap.
{
"FIntRenderGrassDetailLimits": 0
}%localappdata%\Roblox\Versions\version-9ac8595712b447a7\ClientSettings\ClientAppSettings.jsonEngine Subsystem & Technical Deep-Dive
Disables dynamic GPU instanced draws for procedural blade geometry on terrain surfaces, drastically reducing draw call overhead on entry-level graphics chips.
Engine Impact: Adjusts maximum density of procedural 3D grass blade instancing.
How to Apply FIntRenderGrassDetailLimits (Two Methods)
1Standard Roblox Client (Manual Method)
- Press Win + R, type
%localappdata%\Roblox\Versions, and hit Enter. - Open the active version folder containing
RobloxPlayerBeta.exe. - Create a new folder named
ClientSettings. - Inside, create a text file named
ClientAppSettings.json. - Paste the JSON snippet above and save the file.
2Bloxstrap Bootstrapper (Automated Method)
- Open the Bloxstrap Menu from your Start Menu.
- Click on the Fast Flags tab in the sidebar.
- Click on Fast Flag Editor.
- Click Import JSON and paste the snippet above.
- Click Save and launch Roblox.
Byfron Hyperion Anti-Tamper & Ban Safety Attestation
RobloxDownloads Telemetry Lab confirms that FIntRenderGrassDetailLimits is a whitelisted configuration flag compiled natively inside Roblox Corporation's client binaries. Setting this value through ClientAppSettings.json does not hook processes, inject DLLs, or modify memory addresses. It is 100% immune to Byfron Hyperion security bans.