Power BI Report Server May 2021 Released!

Anyone else experiencing report rendering performance issues in this release?

One of our customers PBI Report Servers was upgraded to May 2021, and many of the reports we have on the server now take several minutes to render. This doesn't apply to all reports, and we have had challenges tracking down why certain reports are slow to render and why others only take a few seconds. The CPU and Memory on the Report Server are under 40% utilization, so we aren't resource constrained. The content database has plent of room allocated and its' server not resource constrained either. Here is the an example of some of the odd behavior we are seeing:

If I create a brand new report with a one data source, one data table, and a single table visualization on a blank canvas and upload it to the Report Server, it takes 3 minutes to render on average. This file is less than 1 MB.

An existing report we have that is 300MB, has several pages, background images, and multiple data sources takes less than 5 seconds to render every time. If I take this same report and upload it to a different directory as a "new report", it performs just as well.

All reports have not been configured with a scheduled refresh.

Is anyone else experiencing this same issue? If a Microsoft rep is reading this, I would appreciate any insight you may have into how we can better troubleshoot this issue.

Cheers