Dataset refresh poor performance on premium workspace

I have a dataset copied into two different workspaces.

    a premium workspace attached to a P1 SKU in EAST US 2

    a regular workspace

When refreshed, the dataset in the premium workspace takes from 6 to 8 hours to refresh as seen in the image below, while the regular workspace only takes 1 to 2 hours.

Is there a way to track what the issue is in the premium capacity, the Premium Capacity Premium App does not provide sufficient granular information to pin-point the problem and this is causing a lot of issues with customers.

Thank you,