Slow calendar app
I've noticed that after I was included in an invite for daily meetings that have a Microsoft teams link, my calendar app was unresponsive in all my devices. iPhone, iPad and Mac.
It turns out that when I click those meetings to see the details, I get a beachball (on M1). When I click in other meetings that don't have a teams link, it all works flawlessly and fast.
MacBook Air (2020 or later)