Additional features, settings, or issues not covered by specific Microsoft Teams categories
Guys, I found a relatively good workaround. I'm using now the https://webcatalog.io application. In this application, you can run every web-application like a standalone app. It is a free tool (up to 10 apps). It does also sandbox the related web app. Since Teams is also having a webapp, it can be used inside webcatalog. The look and feel is almost identical and the CPU issues are gone. Give it a try :-)