Hi Donna,
the clean up tool you are looking for is call maintenance tools. The icon is an orange circle with a wrench and a screwdriver in it. In there you can delete temporary files, Repair Com and reset the 2020 design registries.
Files saving slowly can be related to the size of the file, the contents of the file and whether or not you are saving to your computer or into the cloud(like onedrive) or to a network share. If you save to a shared drive the first thing to try is saving the file to your local disk and see if the performance gets better. If not give our support line a call and we will connect with team viewer and take a look at the issue first-hand.
Neil