Latest officially realeased from Corona team - v5, the
Updated windows 10 to latest available builds.
Hardware is already old one, but super stable overall - xeon v4, with sufficient RAM installed.
Latest FP and RC.
I have few cars moving within scene, and rendering motion blur. Also active displacement and using the 2.5D one at 2 px. Autobump disabled.
Cars are using path constraint.
Transforming vertices with or without FP - takes 10 min.
Despite the latest updates with RC, I think that have to change habits and stop using it for a while, until find proper solution.
Will try to collapse geometry, especially the one using splines for clipping and will post results.