Thank you for your reports. We released client and service updates this week, that address many MacOS-specific performance issues. We are also aware of recent performance issues with Microsoft Teams meetings, especially on laptops and when using external monitors.
The team is working to resolve these issues. In the meantime, please find troubleshooting information here: https://docs.microsoft.com/microsoftteams/troubleshoot/known-issues/teams-slow-video-meetings-laptops-4k.
An error occurred while saving the commentSteveM commented
My experience is that any Teams video calls push the Intel CPUs of Mac's into Turbo Boost, hence the loud fan noise. It would be nice if a setting existed in Teams for a quite mode, where video quality might not be so good, but at least it shouldn't cause fans to spin to max just on a simple video call. I have also found that this problem is far worse with an external monitor, also the size of your video window impact this also.
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