Microsoft Teams use too much CPU power and memory, you could this below steps,
1. Update Teams version to the latest
2. Exclude the following items to the "exclusion list" process in the Antivirus Software. This might help to improve the performance.
C:\Users\*\AppData\Local\Microsoft\Teams\current\teams.exe
C:\Users\*\AppData\Local\Microsoft\Teams\update.exe
C:\Users\*\AppData\Local\Microsoft\Teams\stage\squirrel.exe
3.Disable GPU hardware acceleration
4.Clear Teams cache (%appdata%\Microsoft\Teams)