Thank you for your recent votes on the individual performance items. High memory and RAM usage is something we are continuously working to improve, and the team is hard at work on fixes.
If interested, you can find more details on how Teams currently uses Memory at https://docs.microsoft.com/microsoftteams/teams-memory-usage-perf.
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Dear Microsoft, JUST DELETE TEAMS
It's using more than half of my ram meanwhile it doesn't even have feature to delete chat messages.