I am afraid we are not aware of such a problem.
I have tested the provided code and on my side, it is working smoothly, see http://somup.com/cY1OotQziz
A possible reason for the experienced behavior could be if complicated logic is executed in the CalcOutputs() method.
I would suggest taking the CalcOutputs() method out of the OnClientSlide event listener. Instead, you can call it in the OnClientSlideEnd event
I hope this will help!
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