Anyone have pausing or stuttering when trying to engrave at 500 mms?

Lasers
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Anyone have pausing or stuttering when trying to engrave at 500 mms?

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https://plus.google.com/109807573626040317972/posts/4n3q8Mry9df

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I did a couple of times & I found it also jumping sometimes. But that was due to belt tension. The pausing happened only of engraves with a lot going on.