any possibility the slow rendering of spawning gv's could be due to my internet connection?
This could be due to the longstanding GVers gaming the game trick.
AH updates players closer to you faster than those further away (you can see this by a viewing a long distance dot that only moves at intervals vs a guy you're fighting who is moving fluidly) so the old trick is to go to a field on the opposite side of the map to get as far away from the spawn as possible, then move back to the spawning field and spawn in as quickly as possible. It gives the spawning GV a few extra seconds before the game catches up and updates the spawner as normal, rendering him as invisible for those few seconds.
It's one of those exploitable glitches that's been there forever. I don't think most use it but many are aware of it and could. It seems like too much trouble to me for a few second advantage.