Apologies, I know this is an old topic but I'm a new user and there never appeared to be a solution.
I have just jumped over from VRay and I'm finding the scene parsing times when using Railclone ridiculously long. Looking at the stats, it takes, 90 secs to parse the scene that then takes 4 seconds to render.
When I turn off the 3 Railclone objects (roof tiles) I get 0 seconds for parsing. I have checked the 3 RC objects and all have the 'use instancing engine' checked on which I believe is supposed to speed things up (?).
I'm hoping that this is user error rather than Corona.
I'm also assuming that as I have the 'use instancing engine' checked on, the RC multi materials won't work?
Thanks