I'm using partitioning in Pathfinder and it works quite well. It's not hard to beat the CPU. The forerunner of these approaches is the "Massively Parallel Vector Graphics" paper, if you're interested.
It's interesting to note the parallels (no pun intended) with raytracing, in which everyone said it was impossible to improve over the CPU right up until people discovered how to effectively partition with acceleration structures and now raytracers are doing more and more on GPU.
It's interesting to note the parallels (no pun intended) with raytracing, in which everyone said it was impossible to improve over the CPU right up until people discovered how to effectively partition with acceleration structures and now raytracers are doing more and more on GPU.