Well, nothing too specific about it or at least it's quite hard to pinpoint.
The behavior is such: one day I render a scene with some daily - it chews as in that particular example 18gigs, next day nothing changed in the scene itself except for the new daily is out and installed - bam, ram consumption goes 30% or more percent up as in this example up to 27-28gigs. Sometimes it happens even without installing new corona's daily build but after installation of some other software or even some game which comes with some redistributable C++ package.
Noticeable symptoms are such: when ram consumption is low (which is presumably the normal behavior) the amount of virtual ram used and shown in render window scene statistics is high - usually 2x and more times higher than the consumed ram and when ram hungriness occurs it can be +- the same and sometimes even lower than ram. As I said before it is quite hard to pinpoint and usually I detect it only when DR nodes suddenly go out of ram on the previously renderable scene, mainly cause my main workstation got 64gigs of it and it's rather hard to fill that up even when that happens ))
Possible causes : well the only ones I can think of are such - Windows 10 with it's constant updates which changes something which Corona uses, abovementioned differences in installed C++ versions (not totally sure if it applies here but got some bad experiences with different versions of .net in the past so who knows maybe that's relevant for C++ versions too) , some other evil, supernatural crap )
Good thing is the latest installer versions fixed that for me - maybe due to the "right" C++ version which comes with it or maybe due to those specific windows updates which are mentioned in the changelog too - not sure which helped, but I'm happy with the results and thus support the inclusion of those in the installers - as those can be used as go-back-to-normal solution in the future when that crap happens again.
Sorry for plaguing the thread but this issue is somewhat related to the installer so I think it is not too inappropriate here.