Hmm I observed ram usage increase from 28-30gigs of ram up to 42gigs on that scene i'm working on - not a big deal but seems to be on 15%++ side of things yet speed increase is surely worth it )) Anyway that scene of mine uses some proxies, some forestpack objects and some displacement - well the usual wip mess of a scene so it's hard to tell what can be chewing that additional ram + one strange thing I observed while doing some 4k preview rendering of it - scene started to render using some amount of ram then it did displacement + secondary gi and went up to 42gigs (well more or less the usual thing) then it rendered to around 4 passes (around 10 min or something) using those 42gig and then, suddenly, while rendering 5th pass it jumped down to 36gigs - never seen Corona behave like this - maybe it's something wrong on my end and that initial bigger than +15% ram consumption increase difference I'm observing is not normal after all.