I think we don't have a proper name for it, since we just think of it all as fuedalism. Maybe marcantilism can be thought of that way as the other poster said but I don't think that's a 1:1 comparison. When I think "late stage fuedalism", I think the late Ancien Regime in France, where the fuedal institutions had become so calcified that they were simply incapable of responding to the rise of liberalism and the eventual French Revolution.
In this analogy, the remaining fuedal regimes reestablishing the Bourbons maps to Capital restoration in the Soviet Union.
Been porting a game engine I wrote in Python over to Rust, god DAMN this code runs fast. The python version chugs after about 50 objects, but the new version can put up 1000 of the same identical object with the same collision system with no issues.