Premium Guest Access Speed Issues

Hi BallyKahlon 

It seems it could not have speed issues for them.For external guests and internal users,it usually be access issues for external guests.

https://docs.microsoft.com/en-us/power-bi/service-share-dashboards#share-a-dashboard-or-report-with-people-outside-your-organization

https://powerbi.microsoft.com/en-us/blog/power-bi-expands-access-to-intelligence-for-external-guest-users/

Regards