3D Slices - Drawing in a Mesh
Parsing is unusually slow, since the movie creation software (Snapz) is writing to the disk at the same time. But once the file has been parsed it will be cached, until you change the file or hit the "Reload" button.
Parsing is done in a separate thread, and when the "Now" range button triggers an action (in yet another thread) that needs the bounding box the thread waits for the parser to finish. The user interface stays responsive.