Comment 1 for bug 200415

It's a nice thought, but it's going to be a while before we'll be able to do much about it; the codebase is pervasively non-threadsafe.

Rendering is the most obvious candidate for multiple core support, but if we start using hardware acceleration, then multiple rendering threads are actually a liability (they end up wasting IO bandwidth to the GPU). So we need to be prepared to use different strategies depending on the availability of hardware acceleration, etc.