Premium Dataflows throttled when they shouldn't be

Hi j_ocean ,
Based on your description, I looked up documentation on the issue, and I found documentation on capacity limits, which mentions that if you use more capacity than you've purchased during a certain time period, then you can ensure current efficiency by advancing capacity from a later timeframe for the current period, and the later time will be absorbed to make up for the previous overdraft during the peak period. This is why you mentioned not overrunning most of the time and significantly slowing down when you don't. This is to ensure smoothness throughout the run.

You can get more details about the limits after a capacity overrun by checking the official documentation
Understand your Fabric capacity throttling - Microsoft Fabric | Microsoft Learn

Best regards,

Albert He

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