R4 poor performance

Howdy. Sadly my first post is one of disappointment. Just purchased a Minima R4 Uno to compare to a late 2015 Uno. It is used to drive a vinyl turntable motor via SimpleFOC. The old Uno produce a .1% variance while the new one yields a .4% variance in speed. Kinda doesn't make sense as the new Uno has much better specs. Any words of wisdom are appreciated. Cheers.

In all but one critical category. The new R4 Minima doesn't have a crystal. It uses the internal oscillator. I've seen several people report timing issues.

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Good to know, thank you.

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