How do I clean-up all the crap in my IPad.

WHat makes it slow? Do you have a bunch of games on there? A bunch of videos?

Some of the built in apps can be deleted. You can find out which ones by holding your fingers down on an icon until they all wiggle. Any of them with a little X in a circle by them can be deleted.

Beyond that, you’d need to give more details as to your issues to get a more detailed answer.

Your crap is different than mine so I don't know what to tell you what to get rid of. The easiest way is to factory reset it. You will lose everything (photos, videos, music, apps etc) so back it up before resetting.

Usually data on a iPad Pro usually does not make the device slow.

What is the storage size of your iPad Pro and how much free internal data storage space is left on the device?