1: Admin spawn a decent sized fleet containing mostly drones, fighters, and one or two frigates.
2:Choose a pirate station to attack(I was attacking the beta station.)
3: Fight the station for as long as possible, trying to get it to spawn more and more ships. I had no missiles on my ships, but I was fighting for over 30 minutes.
4: Notice late in the fight that some of the ships you are fighting are invulnerable. That means you cannot attack it, nor does it do anything but lag out.
5: If you have rails on your pirate ships, you might get a NAN. I have experienced this first hand and it seems to relate directly to the rail system. Shortly afterward you may discover that everything lags out. If you leave the sector and return, their arrays don't fill in, leaving empty markers.