Export the missions onto the server.
Load up "400_ai_test_server_editor_bis", start the mission and observe the server FPS.

There are 200 Blufor AI and 200 Opfor AI on opposite ends of the runway which will start moving toward each other and eventually engage in combat.

Note that the FPS reaches a constant level once the AI start moving and then a new constant level once the two sides start shooting at each other.

Then Load up "400_ai_test_server_spawn_bis", start the game and wait 10 seconds for the AI to begin spawning. They will then move out in the exact same manner and the rest is exactly the same as the previous mission.

The performance difference between spawned and 'placed' AI could be much greater, as the server performance with the example mission that spawns AI may reach a minimum level with fewer AI.

For both missions, there are 40 groups of 5 basic infantry used on both sides, with a simple move waypoint given to each group leading to the opposite side of the runway (where the opposing side starts).
The code for spawning the AI is executed in the init.sqf.