Some anti-cheat systems (notably Vanguard for Valorant) require Secure Boot and TPM 2.0. Atlas OS 21H2 may disable these. You can re-enable them via the BIOS, but it defeats some performance gains.
Windows 11 21H2 (build 22000.194) – This is the most compatible build for Atlas OS. Atlas Os 21h2 Download
Standard Windows sends a massive amount of data back to Microsoft. Atlas OS is configured to disable: Atlas Os 21h2 Download