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Thanks for reaching out about this in the Community!
If you've enabled Download for a large number of playlists this could significantly slow the app down.
Since this has been going on for several years on a few of your device, there might be an issue with your account.
Can you try asking a fiend/family member to log in with their account on your phone, so that you can test if you get the same slow-down?
Keep us posted on how you get on with this.