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#11
If you haven't already, you should update the laptop's BIOS to the most recent version. If the laptop was unused, it probably still has the original BIOS, which might have bugs limiting its performance.
It also wouldn't hurt to use a disk diagnostic program to inspect the SSD's SMART status. The slowness might be due to disk problems. I use CrystalDiskInfo, which is free. People often use CrystalDiskMark to measure disk performance.
Good suggestion