I have a report that currently retreives data from a large Sharepoint list, and two Sharepoint folders. The refresh time was fine until two days ago, when it grew from a few minutes to more than few hours. The pulls are direct, I'm not having to unpivot data or anything. I've had to open the Query Editor and refresh the tables individually and even that takes an absurd amount of time, for very little data. When I trace back thru my Applied Steps, the issue seems to start after the data is imported, but as soon as I try to Invoke a Custom Function, which makes me think it has something to do with the transform binaries option?
I know that Power BI is showing issues with data refresh from Sharepoint, but I'm also having this issue when I try to refresh from SSAS cube. When I first open the Query Editor, it's showing errors for all my tables, even one I created myself. I have no idea what is going on and / or what steps to take.