Nvidia’s GeForce Game Ready 621.01 WHQL driver, announced October 20, 2026, adds support for Microsoft’s Advanced Shader Delivery on GeForce RTX graphics cards, according to Nvidia’s driver announcement. It’s the company’s second answer to shader compilation stutter, following Auto Shader Compilation, a beta setting that arrived in the Nvidia App in spring 2026.
What Happened: Nvidia’s Shader Compilation Stutter Fix Is Two Features
Shader compilation stutter is the brief freeze you see when a game builds a shader the moment a new effect appears on screen. Nvidia’s own developer stuttering analysis traces this hitch to the timing of shader creation. Nvidia is attacking it in two separate ways, and they’re easy to confuse.
Auto Shader Compilation (ASC) went into beta earlier in 2026, according to The FPS Review and TechPowerUp. It uses idle time to rebuild a DirectX 12 game’s shaders after a driver update, so games have to compile shaders at runtime less often after you update. A newly downloaded game still builds its shaders in-game the first time you play it.
ASC requires Game Ready Driver 595.97 WHQL or newer, and it’s off by default. It works on games you’ve already launched before, since it rebuilds an existing cache rather than building one from scratch.
To turn it on, open the Nvidia App, go to the Graphics tab, then Global Settings > Shader Cache, and enable Auto Shader Compilation. The Shader Cache screen also has a Compile Now option if you’d rather rebuild immediately than wait for idle time.
Advanced Shader Delivery (ASD) is a Microsoft-led pipeline for Windows 11 DirectX 12 games. Developers capture a game’s shaders ahead of time, and a precompiled shader database matched to your hardware is bundled with your download through the Xbox PC app. It only applies to titles whose developers have opted in and whose GPU and driver meet ASD’s requirements.
Current official guidance ties ASD’s launch titles to delivery through the Xbox PC app and its storefront integration, so owning a supported game elsewhere doesn’t guarantee the feature is active yet. PCWorld and Digital Foundry report it needs Windows 11 24H2 or later and driver 621.01 on Nvidia systems.
ASD isn’t Nvidia-only. Microsoft’s DirectX team opened it to AMD Radeon owners in mid-2026 with titles such as Forza Horizon 6, and each GPU vendor sets its own driver requirement. Nvidia’s announcement highlights Call of Duty: Modern Warfare 4 and Gears of War: E-Day. For now, ASD games are delivered via the Xbox PC app on Windows 11 24H2 or later with a qualifying GPU and driver.
How It Stacks Up
| Option | What it targets | Requirements | Limits |
|---|---|---|---|
| Auto Shader Compilation | Shaders rebuilt after driver updates | Driver 595.97 WHQL or newer, Nvidia App (beta, off by default), DX12 game (TechPowerUp) | DX12 titles only. Game must have run once. |
| Advanced Shader Delivery | Precompiled shaders from the cloud | Windows 11 24H2+, driver 621.01 on Nvidia systems, opted-in game delivered via Xbox PC app (PCWorld) | Opted-in titles only, such as Call of Duty: Modern Warfare 4, Gears of War: E-Day, and Forza Horizon 6 |
| In-game “Compiling Shaders” screen | First-launch compilation | Any API | Moves the stutter into a loading screen |
| Larger Shader Cache Size | Keeps more compiled shaders | Nvidia settings | Creates no new shaders |
| Driver rollback | A bad driver release | Older driver package | No official guidance that it restores cache state |
In its 621.01 driver announcement, Nvidia says ASD reaches a near-100% cache hit rate in supported games, and Microsoft says it can cut load times by up to 90%. Both are vendor claims, and we haven’t yet seen independent testing that confirms them.
Cache settings also have a spotty history. A long-running GeForce forum thread asks why the shader cache option in driver profiles appears to do nothing, which is a good reason to judge these features by how your own games feel rather than by a toggle.
The Reaction
Reaction is still forming. Early coverage has focused on the announcement itself, and broad hands-on feedback from players hasn’t built up yet, partly because Nvidia support only arrived with this driver.
Our Take
Verdict: Turn on ASC if you play DX12 games. Ignore ASD unless your game is on the list. Low worry, modest gains.
ASC targets one specific failure: a game that ran fine until you updated your driver or patched it. That’s a common cause of “it was smooth yesterday” stutter, and the toggle costs nothing. It’s reported to focus on DX12 titles, with no confirmed support for Vulkan or DirectX 11 games.
It also won’t fix hitching from asset streaming, CPU bottlenecks, or poor game optimization. If your stutter tracks with texture pop-in or heavy CPU load, look at storage or the processor instead, since an NVMe SSD or a CPU upgrade addresses those problems rather than a shader toggle.
ASD has the bigger long-term promise. Microsoft positions it as a cross-vendor Windows 11 feature, but for now it only covers games whose developers have opted in, delivered through the Xbox PC app on Windows 11 24H2 or later with a qualifying GPU and driver.
Wrapping Up
Here’s the practical move. Update to a current Game Ready Driver (the newest WHQL release; 595.97 and 621.01 are only the minimums for ASC and ASD), turn on Auto Shader Compilation in the Nvidia App, and let it rebuild shaders while your PC is idle. Use Compile Now only if you’re about to play right after a driver update. If your game isn’t DX12 or isn’t on the ASD list, let the in-game shader compilation screen finish before you play.
To confirm ASC is working, check that the toggle is still on after your next driver update. Then see whether the first launch of a DX12 game you’ve already played stutters less than it did after the previous update.
