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M4 Max regularly becomes sluggish/hangs because only efficiency cores are active on mac OS 15.5

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I've got a peculiar issue on my M4 Max running latest macOS 15.5 (non-beta). When playing games on Geforce NOW, the system regularly grinds to a near halt and at the same time only efficiency cores are active. This is silly. How can I work around this? Is there a good way to diagnose why only efficiency cores are active?
Asked by Cornelius Roemer (542 rep)
Jul 22, 2025, 06:34 PM