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Slow On-Premise Report Server Performance /powerbi/api/explore/reports/.../querydata
I am experiencing some slowness on only the Web portal of our Power BI Reports Server (on-premise) install. May 2022 version deployed. The desktop client is not affected. It is only the web portal th...
The RSPortal log file was the key for our issue. There was a Windows Auth error in there that was taking up the majority of the time. We are using a Domain account for the PowerBI serveice to run under and that account did not have the privliges needed.
This does not sound like normal behaviour for a quiet server. You could try checking the VM Host, if that is overly busy you might not see that on the Report Server VM. Or you could try checking some of the Report Server log files. Particularly the RSPortal and RSPowerBI ones to see if there are any errors or retry messages there.