1. Open the "WIndows Security" on your computer(Settings > Update & Security > Windows Security > Open windows Security.
2. Tap on the "Device performance & health" option
3. Then, check the list for any yellow marks
4. Now, Press Ctrl+Shift+Esc to fix the task manager
See also - https://community.sprintally.com/read-blog/17281_how-to-check-your-computer-performance-on-windows-10.html