This article explains how to check the specs of a Chromebook. Instructions apply to all devices running Chrome OS.
How to Check a Chromebook's Hardware or System Specifications
On a regular PC, you can use an app like Task Manager to see how much memory, CPU, or network bandwidth an app is using. On a Chromebook, you'll need to use the Chromebook Task Manager.
Open Google Chrome on your Chromebook.
Select the three-dot menu at the top right, then select More tools > Task Manager.