After the update today, I did more testing. It appears that the slowness is limited to a specific save game. I’ve uploaded it (except the save game is larger than the file limit size so I didn’t upload it).
You’ll see that there’s slowness in movement across the world map screen and, if you get into a fight, there’ll be slowness in the animations during the fight.
I’ll continue playing from an earlier save that doesn’t have the problem and see if the issue reoccurs.