Engine settings

Engine settings controls how the managed Roblox client starts: performance, rendering, audio, and FastFlags.

Save with Save after editing (unless batch save is enabled globally).

Sections (typical)

Area	Examples
Performance	FPS cap, texture quality, mesh quality, grass distance
Rendering	Rendering mode, anti-aliasing, fog, post-processing toggles
Audio	Music mute, old sounds, in-game sound toggles
FastFlags	JSON editor, import packs, allowlisted bindings
Loadouts	Save and apply named flag presets

FastFlags

Carbon exposes a curated set of flags through toggles and a JSON field (fastFlagsJson). Use Flag pack browser to import community packs when available.

Caution

Flags change client behavior. Invalid JSON or unsupported flags may prevent launch or cause instability. Reset to defaults from the page if needed.

Loadouts let you switch between profiles (for example “competitive FPS” vs “quality”) without retyping JSON.

When settings apply

Engine settings apply on next launch. A running client will not pick up new flags until you restart Roblox through Carbon.

Related

• Launcher: Roblox channel and reinstall.
• Developer reference: flags are managed in the open-source launcher (FastFlagManager).