Excel 365 is UNUSABLE for professional work — performance has catastrophically degraded

"You have systematically degraded the performance of the most important business application on the planet in order to ship a prettier UI that nobody asked for. Your Fluent visual refresh, your new rendering pipeline, your animations and transparency effects — all of it has come at the direct expense of the people who actually use Excel for real work."

TOTALY AGREE : We want back a usable tool !

It is now almost impossible to do a decent work with more than 50 000 and I need to work with 300 000. (that was possible several years ago)