Finally offed the twins in expert. Wasn't that bad with buffs going and a nice asphalt runway to charge up and down.
... there's also now a railway from the starting spawn point (where I built all the NPC housing) and the western ocean. Took... something like 1400 track, I think? Full stack, plus about 4-500. Super minecart maxes out 102 mph according to the speedometer. About to test and see if swiftness potions effect it :V
Also yeah, going through that many chunks that quickly makes my FPS plummet. It's kinda' hilarious. You can feel the game going, "SHiiiiit what are you doing stahp"
Fakeedit: Swiftness potion does not, in fact, effect the minecart. Sadness. Also it takes about 22 seconds by rail to get from far west end of the map to the middle of it ^_^
... less, to get from the middle to the west. Booster tracks <3
Actual edit: Oh hey, I didn't know you could get multiple flying dutchmen in a single pirate invasion! That's neat. Also the minecart laser thing kinda' shreds -- hella' damage on the thing, if you can keep it pointed in the right direction. Just blew up pretty much all of a pirate invasion by chucking possessed axes at pirates from my railway, occasionally burning one to bits with cartlaser, which managed to cut off something like a quarter to a half of a dutchman's health off in one pass. It was interesting!