The biggest problem with doing a patch in JSGME format
is that you can't delete whole folders.
(hint, hint

)
So I'd spend as much time writeing single file deletes for JSGME as I would
doing a whole installer.
Part of the update involves the removel of unused things now in 2.1
And,
as I go through more files?
I can lop off even more of the loading time.
So if the load time from 2.1 to 3.0 saved you 2 minutes?
I estimate another 2 to 3 minutes could be cut out.