External GPU (MacOS) makes Help painfully slow

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I have added an external Radeon RX 570 GPU to my 2019 MacBook Pro running MacOS Catalina. I enabled "Prefer external GPU" in Get Info for the MATLAB app.
MATLAB runs fine, but Help runs painfully slow compared to when I didn't have the external GPU. For instance, there's about a one second delay between typing a character into the search box and it appearing there.
Is there an explanation for this strabnge behaviour, or a solution?

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