HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

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HoMM3 HD 3.0 Final

The Berserker's CPU patch is probably not loading correctly; the processor is heavily loaded, especially during movement in battle. I selected Berserker's CPU patch = 1 (also tried = 2) - the result is the same. In version 2.98, the processor is not heavily loaded. I'm using the same executable with both launchers.
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My apologies, I was mistaken. In reality, all battle settings and options are being reset and saved not to the registry, but to the _HD3_.ini file. And, of course, I overlooked the animation speed setting. Now everything is working correctly.