Meanwhile my dual SSD Dell launch teams in 30s, and it takes slightly longer on M1 Mac.
Ugh.... Why is MS Teams such a resource hog, for a glorified IM client? Seriously, I *really* miss the days working for a previous employer who used Slack for that stuff and only kept an O365 subscription so we could all use the desktop Office apps with local installations, plus Microsoft handling the Exchange mailboxes for Outlook.
Now, I'm with a place that's "all in" on practically everything MS offers -- so we have no more traditional "file servers / shares" to connect to on the network. It's all OneDrive synced to SharePoint sites people have to visit through the web initially and click the "Sync" button to add them to their OneDrive, and reports all done with "Power BI" and "Microsoft Flow" in the cloud, etc. etc. Every time MS has some small outage, our company gets affected and trouble tickets roll in (that you obviously can do nothing about).
And of course, they see zero purpose for a Mac anyplace in the business ... so for the first time in over a decade, I'm using nothing at work but Windows.
Bottom line though? Teams has awful performance on any platform you launch it on.