http://i.imgur.com/dvYQr3S.jpg
placing more wire directly next to this cluster causes the internal server to freeze up for some time with a lot of "can't keep up!" in the log and the wire takes a lot of time to appear in the world
other wires gates or lamps placed while in this laggy state also causes them to only appear after some time
normal blocks like sapphire ore are fine and place fine
opening the inventory is also slow
the lag seems to be somewhat proportional to the amount of connections each wire has a single straight line does not lag two lines next to each other lags only a slight amount (lag being the amount of time it takes for the next wire placed to appear)
it does not seems to matter if the wires are on walls on the floor or both like in the picture
free standing wire is also affected in the same way so is bundled
it also does not matter if it is blue red or purple wire
having such constellations of wire in the world also slows down world loading by a lot