Just did two rounds of testing with the Wonderful101 patch against MGR Rising as indicated by this on PCGamingWiki:
I regret that after almost exactly 2 hours in both cases, something forces the frame rate back down to ~59.
There's a fix for a similar issue in Bayonetta implemented in this Bayohook project.
Can what they did be applied to this project I wonder?
Just hoping and praying that we'll eventually get a definitive edition of MGR:R on PC without these pacing issues.