Official comment
Go into the rekordbox Preferences > Analysis and check that it's in Performance mode, otherwise it will analyse one track at a time instead of up-to the number of processor cores available:

It's suddenly taking absolutely ages to analyze a few songs on rekordbox, I don't know what has happened but before it used to take a few minutes analyzing 30 songs now its taking hours, i'm not sure why this has happened, i'm still using the same laptop as before, I thought it could have been because of an update but I uninstalled the update and used an older version and it's still the same, this is very inconvenient and if this is how long its going to take to upload and analyze a few songs it's going to be very hard for me to use.
please help
Go into the rekordbox Preferences > Analysis and check that it's in Performance mode, otherwise it will analyse one track at a time instead of up-to the number of processor cores available:

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