Wine using 200% CPU to run Might and Magic 6: Mandate of Heaven

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I've installed MM6 using this guide, with the only differences that I'm using a virtual desktop size of 2400x1800 and recent versions of everything:
- Ubuntu 20.04
- PlayOnLinux 4.3.4
- Wine 5.0
- GrayFace MM6 Patch v2.4
The game works fine, but uses 200% CPU even when on the intro screen. Why would it use such a huge amount of CPU, and are there any simple ways to improve the situation?
A Wine debug session showed nothing obvious, but then I'm not an expert.
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