Just try the same hardware with clean Windows 10 and Teams installed, and you will see that it will be no any slowness.
If your car cannot drive because there are roadblocks, the problem is not the car - but roadblocks. Remove roadblocks and your car will fly :-).
yeah, nope. On my Lenovo ThinkPad P50 I daily use Chome, 3 or 4 instances of IntelliJ IDEA, Outlook, Spotify and Teams... only Teams presents performance issues... even with all the other apps closed. Today I just turned on my laptop, opened Teams, try to
text chat with team mates... unusable, 25% CPU usage, 1.5GB RAM... ridiculous.
So... I have several cars on the same road, only one is left behind... I would bet it is the car