After new round of profiling, found that slowest part now is animation of tracks. It’s done by moving ISM treads along the spline, the slowest operations are getting position, rotation and etc. from spline components, followed by math where they used.
So TrackAnimationDrive is the next victim of the c++ transition.
Ideally is to use “lighter” technique with skinned mesh and animated material. I should add it as example, it was available in previous project some time ago. Even if you prefer new system more, they both can be used at the same time as LODs - detailed tracks for “hero” tank and skinned mesh for the rest.