Windows 11 users often attempt to gain a performance boost by deleting the Prefetch folder. However, Microsoft has confirmed that this has the opposite effect and will slow down your application load times. It's important information that puts an end to a common performance optimization myth that's a huge time-waster and doesn't even save space. It's common for people to tweak system files to gain small performance advantages, but Microsoft has clarified that cleaning out the Prefetch folder doesn't make Windows 11 faster and might actually increase your application launch time.
Microsoft clarifies that deleting the Prefetch folder slows down Windows 11 apps
The Prefetch folder is a set of read-only lists that keep track of pages and files used by applications. These are not copies of your software. Deleting them saves an insignificant amount of space.
Windows automatically maintains this folder. It saves up to 1,024 files and old ones are cleaned up (since Windows 8). It does all of this without needing any user involvement.
From testing, deleting the Prefetch files results in a negligible or barely perceptible slowdown while running the apps. It's more noticeable on lower spec systems or right after a reboot. Prefetch was designed to speed up random read performance on mechanical hard drives. But with the advent of solid-state drives and faster CPUs, the kind of bottleneck this feature was created to solve isn't so much of a problem anymore.
Microsoft's official performance suggestions don't include deleting Prefetch files. Instead, they recommend disabling startup apps. They also encourage you to utilize the built-in Storage Sense to do a better job of system maintenance.
As we talked about in the last Windows 11 update, some of the same balancing and stability topics came up. The available tools offer safer and more effective solutions to improve system responsiveness.
Microsoft confirms deleting the Prefetch folder won't make Windows 11 any faster, and might actually be detrimental to performance. Stick with official tools like Storage Sense and startup controls to optimize. That's the end of the mystery around manual deletion being a good way to get a speed boost.
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