High Ram Usage can slow down your computer.
This web page is talking about a Windows computer, and Alt+Shift+Esc doesn't work on a Chromebook.
But the Task Manager in Chromebook settings allows you to do the same thing. (remove that mess)

https://softwarekeep.com/help-center/how-to-fix-high-ram-usage-on-windows

Here you see where I just cleared it from this Chromebook.

https://www.geocities.ws/bkbrat/Pages/MemoryFootprint.png

https://www.geocities.ws/bkbrat/Pages/MemoryCleared.png