Did some testing with the loading videos and I can say:
the length of the LV does not matter at all.
First I checked again loading time before you can really play the table with my default settings (but no launch audio), it was 37 sec.
Then I deleted all videos from the LV dir, same result. Then I placed a very long video (1m40) in the LV subdir, when starting the table it starts this video but again, after 37 sec the table is up-and-running.
So, LV had no effect on loading times, it was just the Launch Audio that did.
One weird thing though:
When starting this table from PBX first I see DOF become active (by the undercab and speaker lights) and the BG shows.
But it takes an other 16 sec's before the table is playable (it appears first after 14sec, disappears and then the talbe comes back and you can play).
When starting directly from VPX the time between BG appearing and table is ready is 6 sec's so less then half the time.
But..well..can live with that, it's just an observation.