My guild has a farm in our castle, although I'm not 100% sure on all the "how to build this building" and such. You can obtain Battletime, which increases spell casting rate (and movement speed I remember?) and another buff that just increases movement speed for merits, and they do show on your buff bar.
Godspeed is from housekeeper, make sure you have a housekeeper that specializes in crafting. Mine gives me at level 81.
And yeah, a lot of endgamers go into SW with the same buffs that they would run an endgame instance with -_-
Not sure if its stable that grants the permanent 10% or 15% movement speed buff during SW, but I do know that you can pay a couple hundred gold for an extra movement speed buff that stacks. Me and my guildies usually buy that at the start of SW for extra speed.