AI and number of units in game

[Q]

That's also my experience. The AI does not destroy old units or scrap ships (unless they lack resources). So the higher the limit the better for the AI. The only limitation might be your computer performance: the turns may take very long with many ships and units if you don't have a fast processor

[Nitram Draw]

What do you think a good upper limit is?
The reason I haven't changed it is that I was concerned about the AI running out of resources by building huge fleets and lots of units. It does seem that I should increase the limit though, as I have run into more undefended planets now that the AI is getting better and my games are taking longer to finish.

[jc173]

Well for units I think it's more a question of how difficult you want the game to be, since they cost no maintenance. I used to keep it at 3500 in earlier Versions, but bumped it up to 5000. I do play in a large galaxy with a higher warp number of warp points per system.