MacOS High Sierra poor performance after reboot on a USB stick

Hi! I have an old Macbook (mid 2010) that has an issue with either that the startup disk is missing or has a corrupt operating system. I tried rebooting macOS high sierra on a USB stick and managed to get the Mac functioning again. However, the Mac is now performing really poorly. It is painfully slow and lags quite a bit. Anyone have a solution on how to fix the performance? Thanks in advance!

submitted by /u/ArntAmadeus
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