Start here if you're new to Fast Flags, or jump to the database if you already know what you're looking for.
What Fast Flags actually are, the FFlag/DFFlag/FInt/DFInt naming convention, and what changed with Roblox's 2025 allowlist.
The two ways to apply Fast Flags, which tools work on which platform, and how to do it safely.
Which flags actually affect frame rate, sourced to real verified presets — not a guess.