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View GPU activity in Activity Monitor on Mac
You can see how hard the GPU in your Mac has been working.
In the Activity Monitor app
on your Mac, choose Window > GPU History.
Note: If an Afterburner graphics card is connected to your Mac, choose Window > Afterburner History to display a graph that shows the Afterburner card usage.
If your Mac feels hot or the battery drains quickly, check the GPU activity. If you see many tall blue bars packed tightly together, consider using an external GPU to handle some of the workload.