I have a Lenovo ideapad Y510p, which has lost A LOT of its speed over the last year. I recently did a full format and reinstall of Windows 10, but the effects were not as good as I hoped.
Then, recently, I discovered that my SSD cache is showing "Formatted: 0 MB" in task manager. Might that be the reason? I don't want to format the SSD disk and risk messing it anymore up, if I'm not sure that it's not supposed to be like that.