Thank you for your reports. We are 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.
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corresponding github issue:
Whenever I share my screen in Teams, all other programs become more or less unusable! E.g. just opening a page in Edge takes a minute or so.
This is on a new and powerful Dell laptop with external monitor (both internal and external monitor at 1920x1080 resolution).
Thank you for your feedback. The reply feature is currently being tested internally. We will share another update as soon as one is available.