So now you may be wondering, “If threading has all those problems how can you get a speedup?” Well we had to be smart about it, and figure out a way to make threading work based on the properties of the hardware. As an example, both Jake Stine (Air) and I have in the past experimented with naively threading VU1, and in addition to getting unstable graphics and crashes, our attempts also ran slower. The other problem is that just running a component on a thread is actually going to be a slow-down unless the thread is doing a lot of work without having to sync with other components. One problem is that threading the components (say GIF and VU1) at the same time, will lead to very bad syncing errors if the GIF and VU1 need to communicate with each other (and they do).
