With FCC the change to DSO (where the movement and period dimensions are dense) really speeds everything up. One area that has still seemed slow involves QTD and YTD reporting. The fix for this is to adjust the solve order for the consolidation dimension. All of the dynamic parents should have a solve order of 51 (not 50 or 52 but 51).
This change is scheduled to be pushed to the pods with the June 2022 update.
In case you think I have a crystal ball or a hotline direct to the development team, you're right, I do. But actually I found out about this on a cloud customer connect post to the FCC forum. So even if you don't have a question to post, there are still benefits to following the forum and finding out what others are saying.
By the way, here's the original cloud customer connect post. See the bottom of the responses for the details.
https://community.oracle.com/customerconnect/discussion/610242/making-period-and-movement-dense-report-performance-issues-with-qtd-ytd-views#latest