Just did a few tests with a pair of SLF equipped Corvettes.
Everything started off normal, but spamming orders almost instantly induced rubberbanding, which then persisted for the duration of the instance. Worse, even without excessive manual orders, it appears that the issue eventually cropped up regardless, though it was much slower to do so; the AI itself seems to be the problem.
This was also not limited to NPC crew flying the fighters; it happened even when they were left in command of the motherships, with the CMDRs in the fighters.
I also observed a fairly large bandwidth spike on the meter while commands were being hammered...not enough for bandwidth itself to be the limiting factor, but telling none the less. Didn't have the presence of mind to check CPU load, but I'll try to do that later.
Uploading my test now, will link it here and in the issue tracker when it's done processing.