This is important guys, the latest version of Izumi has a change that can affect the performance of some animations, her groove bone has a new position, it's been moved from between her legs to near her center of mass, only animations that used the groove bone to rotate the body in the x or z axis are affected, something that I never do, I only rotate the center bone or groove bone in the y axis, otherwise I just use the lower and upper body bones at the same time, with this change that will no longer be the case, if you have problems using my future animations that make use of the groove bone then I'd suggest modifying them to work with it, you'll have to move the groove bone at the same height for that the lower body bone is and to the center of the torso (make sure to align the center bone with the same Z and X coordinates) in the z axis and that would be it, Izumi version 2.0.31l and Maran V5 already have this change applied and the my new animation for them make use of the new modifications, give them a try, the new animation is in the Unreleased content folder and the new versions of Maran and Izumi are there too even though they are already public.
Other than that there were only more adjustments to her physics to make them even more easy to jiggle, and the bones that enable her forearm to twist have all new position, although this was an under the hood change and the performance has no change.