I noticed this on part of the tutorial level that if you kill enough people in one spot they're dropped weapons seem to stack up and cause massive lag (like to the point where it is no longer playable). Don't know if there is any point to having units drop weapons, but if there isn't it might be worth just disabling weapon drops.
On a few other notes, I noticed on several occasions where the defensive structures would not build in the direction you specify, kind of annoying but not a game stopper.
I've also noticed several occasions where units refuse to shoot at a target (Like an antlion guard) and it proceeds to kill them all without any fight.
Overall though, great mod (and I know it's still a work in progress), and can't wait to see the next update!
