Keynote opens and saves slowly on macOS Sequoia

Slowness in App's can be caused by many different factors.

EtreCheckPro is an excellent tool for sorting out slowness and various other problems.

Download and run the free version of EtreCheckPro, from > https://etrecheck.com/en/index.html

Then post back here with your Report, as per > How to use the Add Text Feature When Post… - Apple Community