Given that GitHub is a large Ruby on Rails app, I’m surprised we haven’t seen Microsoft doing more to improve the performance of Ruby language given they are one of a small handful of companies that have deep language/compiler talent. (Don’t take this as me knocking Microsoft. The speed of development on GitHub, VS Code and even Microsoft 365 has been phenomenal.)
GitHub is okay-ish.
But Office 365? Teams is prob one of the worst apps I use nowadays. It consumes so much memory and cpu you would think it's actually mining crypto.
Outlook is also a joke.
Excel got better IMO.
No strong opinions for other apps.