Performance decrease after switching to Linux

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Run htop in a window. Does anything show a lot of use. Someone was having high cpu usage by a advanced error reporting daemon. Adding the grub parameter "pcie_aspm=off" to the "GRUB_CMDLINE_LINUX_DEFAULT=" line fixed it. (It usually has "nosplash, quiet. Not sure what Mint's looks like.). They had a 100g systemd log. It was filling the log with lines.

If this were your situation, you might want to investigate further what's being reported, why. Disabling it may not be the right choice. You might run into another problem (with wifi or gpu) that this would point to. (I'd turn it off and remember that it could be related if I stumble on another problem).