Can get dual autofire even on the highest end systems. I can get two without even having to stall my internet. If you want more then that though, then yes, you either need a bad comp, or a sluggish net.
Either way, because the check is client-side. There isnt much that can be done about that.
Autofiring everything isnt practical on anything but a full cannon build anyways. I always have my beam banks on manual so I can pop a BO III whenever I please, or if someone pops a feedback pulse.
On the same note: To any avid PVPers out there. If you find someone autofiring 8 beambanks in a cruiser, pop FPIII please. I'd love to see the damage from that.