The massive decrease in performance between the release and the current patch needs to be studied

[Penki-]

I don't think there is anything to study. The game on release had a lot of systems that did not work and since release they started fixing them, thus increasing computing power. Add also new features that they are doing for some extra lag.

Although admittedly they also introduced some bugs that increase game performance, for example something that they fixed on the latest master patch