Just wanted to touch base on the above issue.
I had an impression this is not working ok in the past, although this week we had to re-render some elements in animated sequence, and indeed we encounter exactly the same issue.
The whole frame in HD resolution takes 20mins to render, if we use render selected option (from Render Setup -> Scene) and include list (i.e car wheels only), rendering time increases to 40mins minimum or more.
That is quite bizarre. Especially that our frame looks like the attached, two wheels, not very reflective.
We are using max 2022, latest corona 7 (hotfix1).
Can this be investigated before the release of Corona 8?