I have some Vostro 15 laptops that were purchased during COVID, and we're facing some unusual problems that make them not meet our standards. Even though we're going to replace them, I'm curious about what's going on. After making sure they're fully updated and running Windows 11 25H2, I've noticed that upon boot, SysMain, Prefetch, and Superfetch go wild for about 15 minutes, spiking read/write speeds to hundreds of MBps before calming down. I've tinkered with the registry a bit and ended up disabling SysMain, which solves the issue. Has anyone else experienced this? Is there a possible fix, or is this just Microsoft being Microsoft?
4 Answers
Superfetch should ideally be off if you're running an SSD. There's a consensus among tech experts that keeping it on with SSDs just doesn’t make sense. It seems Microsoft hasn't completely addressed this yet, as recent Windows Server releases still lack full NVMe support.
The hardware specs matter here. If the Vostros are underpowered, SysMain might not function properly. Sometimes at boot, multiple disk-heavy processes like indexing or antivirus scans can clash, causing these issues. If you're low on RAM, Windows might also be trying to cache prefetched files, making things worse. Disabling SysMain might be the best call if that's the case.
Considering those were purchased during COVID, they're likely out of warranty by now, so it might be time to retire them regardless of the issues you're having. But yeah, it’s interesting to see if Superfetch/Payload concerns have resurfaced. Seems like a recurring issue.
I've had issues with Superfetch/SysMain for years. While it improved a lot around the full release of Windows 11, Windows 10 had its fair share of problems too. Disabling these services rarely affected core functionality; we used to do it routinely without any trouble in corporate environments. It might be worth considering if the headaches are back with Windows 11.
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