In that particular setup the units were disseminated all over the map, so only a little portion of them were uncached at any moment.(maybe two three groups, up to 5 or 6 in populated areas).
I just fired a up a light version of this (i think i did that originally to add ALICE on top of this, but i renounced) to check if i didn't dream this:
46 AI zones
around 620 units (depending on each launch)
115 DAC groups plus mine.
My computer claims that i'm running 50 fps on totally unhabited areas (the northwest little Island on lingor), and 25 mini in heavily populated zones (Maruko).
Now I believe it's a bit optimistic and i must have drops at around 10.
That's running a whole lots of mods on top of this (ACE, all ACEXs, all Lingor associated mods and units, bb_oa_mercs, ASR_AI, ad_helos...).
Now don't get me wrong. I have absolutely no other script running on this, and the AI is probably dumber than a rock. I'll keep it loaded see if that degrades.
Anyway, doesn't change anything to the point: 2000 units, fighting, don't even dream about this, unless you work for the NASA.
Edit: Uh oh, wrong. I actually have
ALICE enabled on this
But the enemy AI is dumb as hell and won't shoot me, even when i'm very close.
Re-edit: wrong again. I actually had myself set as captive.
Wait. This might actually be a playable mission?