So I've been playing this custom map I found online, "Big Blue", which has roughly 240 some odd planets and 26 stars, I believe. I've noticed, though, that after about 4 hours into game, where most of the area is explored and war has finally set in, things go weird...
It started simple enough, my HC's began to react very slowly to intruders on my gravity well, or not at all. I'd have to command them to attack, or they'd take a while to decide something was present (this was only HC's for some reason, mind you). I also noticed this behavior in the Neutral inhabitants of the outter planets that had remained somehow un-discovered to this point.
As if that weren't enough, other odd ocurrences came in the form of confused ship pathing, and stalling / sudden cease of path movement / spinning in place once or twice before moving in the correct direction.
Now, please understand, this was NOT Frame lag, and it didn't appear to be system lag, either (No real signs like stuttering or omnicient halting). I run an nVidia 8600 series, on Windows Vista Premium, with 2 gigs of DDR-2 dual channel RAM, and a 2.6 ghz Dual Core AMD. Nothing spectacular, but nothing to sneeze at either.
So I guess my question is... is there some (practical) operational limit to the size of the game, or was I just feeling some computational lag -- without the normal side effects?