Well, here they are.
As of right now, I can simulate the movement of 5000 Simulin simultaneously every frame with minor performance loss. ~1 to 4 frame loss every now and then. seems the minor performance loss is there regardless if it's 1000, 3000 or 5000 Simulin. I'm not sure how many can be simulated on screen at once, but both the browser and server can compute the position of 5000 comfortably.
I added a bunch of optimisation code to bumb it up from 1500 to 5000. If I tone down the detail of the model I'll be able to display more yet too. Heck if I really wanted to I could just make a box and call it a Simulin, if I did that I could simulate 10000.
Of course they don't do anything other than move like mindless drones. Walking over mountains and love to walk into the oceans never to return. I guess now I'll have to code where they can and can't go. Gonna dig up my old dynamic pathfinding alg and put it to work.
What does everyone think? Do you like the look of them? They're kind of Roboty in my opinion, not sure if that's a good or bad thing.