Thank you for your continued feedback. We are continuously improving the clients to use less memory and RAM.
The upgrade to Electron 10 has rolled out fully to the public at this point. Telemetry and testing has shown that this is helping to improve memory performance on the client.
We will continue to work on improvements, and will share more updates as they become available.
For more details on how Teams currently uses memory, please visit https://docs.microsoft.com/en-us/microsoftteams/teams-memory-usage-perf.
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Completely freezes my computer when connected to 4K monitor
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.