Chromebooks do not process well with many applications open.
Your Chromebook has been running for too long.
You have not restarted your Chromebook in a while.
If your Chromebook freezes when you have a browser tab open, hit Ctrl + Shift + R to perform a hard refresh.
If your Chromebook freezes and the hard refresh does not work, click the power button on your Chromebook. Hold it for at least five seconds or until the screen goes black.
Close most or all tabs or apps that are running on your Chromebook. If you have any extensions running on the Chrome browser, turn them off.
Close open tabs:
If you are using Google Meet or Zoom, you may want to close all tabs and other applications to ensure your Chromebook works efficiently.
The more tabs you have open, the slower your Chromebook operates, for it is trying to handle several tasks at once.
Clear your Cache (temporary saved data) [Warning: this deletes your data]