Hour into the game. Just a simple single player with one AI. I dominated early on, and put up a patrol blocking any advance, then set it at Fastest Game speed and started to work hard to brake the game.
I'm on a R9 390X and a Phenom 980, so only four core 3.7 Ghz, and I started to noticed lag at about 5500/6000. By 8500 it was really bad, and I mean horrible lag. CPU was pegged at 100% by the 7k mark.
Around 3,500 I couldn't view my main army, as it immediately would be a hard Crash To Desktop. So from that point I couldn't do anything with the new units that were flooding in.
I had about 40 Quantum Factories (can't recall the right name off hand right now).
After finding these bugs, I tried to make my patrol army take the AI out, the system wouldn't crash, but wouldn't do anything. The game just kept trying to move units, but it was a horrid crawl. After letting it compute for an hour, I ALT+F4'd out of it to regain control of the system. It was so bad CTRL+ALT+DEL gave warning saying it didn't have resources to load the login screen. I laughed pretty good, haven't seen that before.
8 GB of RAM in the system, I only used 6 GB of it from my last view of Task Manager before I shut it down. I did notice I have a Pagefile going on, and need to look into that. I don't want a Pagefile running on my SSD anytime soon...