If that's not it, it is time to embrace the built-in DTrace tools Mac has for your computing pleasure. This can help you track the calls Roxio makes when it's appears to be running dog slow.
Dtruss is very much like truss or strace – it will show you system calls made by whatever you are dtrussing. If what you are trying to figure out is shortlived, execsnoop is also your friend as it will show you system calls for any new processes as they are spawned.
Dtruss and execsnoop show when Toast starts up that automountd is always called, thus stale NFS mounts could be causing you headaches.