I've noticed some people in this forum have highlighted limits in the Multi-Threading in Vue, ie specific features are single threaded.
Is there a (I know this is a big ask) list of the threading limits, especialy in regards to Rendering?

As rendering goes, only panorama renders are not multithreaded.
Other single threaded areas are: ecosystem population (and only the population phase), procedural terrain building ( terrain editor and preparation phase for the render).
There might be others, but I don't remember now.
This is for Vue7.2 of course.

I'm pretty sure the pre-rendering processes are single threaded. Using a quadcore and in taskmanager Vue is 25% in load (means 1 core is working on it) then when the actual rendering starts it it jumps to 95-98% load.

Pre-calculations like in displacement mapping can take painfully long and there's no progress bar for it.

There are so many single threaded parts of vue 7 that it really isn't multi cpu capable IMO.

When you need multi cpu the most vue fails.  Radiosity caculations, baking, & displacement are all single cpu, so the quad users suffer the worst at these moments.

 At least until the 7.4 upgrade, when several of those single thread subsystems become multithread capable.....