Disable SysMain (Superfetch)
Also searched as: sysmain · superfetch
What it does
Stops the service that preloads frequently-used apps into RAM.
The honest verdict
Graded real. On an SSD/NVMe there's little to gain from preloading, so turning SysMain off cuts its background disk activity and steadies RAM use. It doesn't 'free' a set amount of memory — that cache was reclaimable standby RAM Windows already releases when apps need it. …
Where it genuinely fits a rig, Compy can recommend it — applied with a snapshot first and a one-click rollback after, like every change it makes.
The full graded entry
The rest of this write-up — the specifics behind the grade — ships inside the app. The Blackbook publishes its verdicts here — the full write-ups stay in the book, on your rig, next to your own measurements.
The Compy Blackbook holds 191 graded entries like this one, judged against your hardware — and every change it does make is reversible, with the receipt to prove it.
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