I'm stressing the system now...I'll report back shortly.
7.3/7.3 Mine Enthusiast and Special Forces Captain
120 Planet snake, with 8 homeworlds.
Main menu start: 100,000K
92405 foreground objects at game start, 610,000K mem after 15sec.
100,200 total ships, 932,000K @ 10min
102,100 total ships, 955,000K @ 15min (end, no more time!)
Restarted, 102,040 FG objects, memory started at 615,000K at start of game reload, rose quickly, and leveled off at 735,000K (I didn't have time to wait and see, but it stopped climbing rapidly, and seemed more stable).
I should be able to get results from a longer game later..