You might ask: Why not Windows 11 or the newer 22H2? The community consensus is that before they started backporting Windows 11's telemetry and UI lag.
: LTSC 2021 (based on 21H2) already lacks many of the "apps" and "telemetry" found in standard Windows, making the ReviOS Playbook even more effective.
Revios sometimes disables the High Precision Event Timer (HPET). Re-enable it via Device Manager or use bcdedit /set useplatformclock true .
Use the official ReviOS Playbook v23.12+ on a clean install of Windows 10 21H2. revios windows 10 21h2 best
What specific are you trying to optimize for?
A stock Windows 10 21H2 idle uses roughly 2.5GB to 3GB of RAM. A fresh Revios 21H2 installation idles at . Process count drops from ~140 background processes to ~35. This is the #1 reason users call it the "best" for gaming.
What are your primary (CPU, GPU, RAM)? What specific games or applications do you plan to run? You might ask: Why not Windows 11 or the newer 22H2
ReviOS provides a PowerShell script called + a ReviOS preset. This is the best method for most users.
Some deeply integrated Microsoft services, like Windows Hello facial recognition or certain Xbox Live cloud saving features, may require manual troubleshooting or the use of the "Revision Tool" to re-enable.
Updates are disabled until 2038 to prevent performance-killing forced updates (note: this can be re-enabled by the user if necessary). Revios sometimes disables the High Precision Event Timer
We polled users from the Revios subreddit regarding their experience with 21H2 on low-end hardware:
In this long-form guide, we will explore everything you need to know about practices, installation, performance benchmarks, and why this specific combination is considered the "Holy Grail" for resurrecting old hardware and maximizing FPS in modern games.
If you want full control (no scripts), apply these manual "Revios-style" optimizations:
Because the CPU is not busy handling background updates or indexing files, it can feed instructions to your graphics card much faster. Users frequently report a 5% to 15% increase in average frame rates, alongside a massive improvement in 1% low FPS, which means fewer micro-stutters during intense firefights. Faster Boot and Load Times