Lag, slow load, just spinning

Ok great, thanks for all the input everyone. We can see from telemetry that imported datasets are occasionally hit pretty hard performance-wise (as opposed to on-prem datasets connected to via gateway), and it seems like some regions are hit a lot harder than others even though most regions are hitting occasional issues.

To help correlate this telemetry with what everyone here is seeing, could you please state the region for your tenant where the slow loading is happening for you please? You can identify the region by going through the menu in the top right "?->About Power BI" and reading the "Your data is stored in" property in the dialog.