Roland Johansen
Deity
This has probably been asked before - but are there any hard caps on numbers of civilizations, units, cities, map size, etc., in Civ4/BtS?
(I recall that in Civ2, cities were capped at 255, civilizations at 7 (plus barbarian), units at 2047 and map size at 32767 tiles.)
If there aren't, what affects processor speed the most? Map size, civilization #s, or unit #s?
The standard number of civilisations cap is 18 (I believe), but it has been modded by many modders and it isn't that hard to change that number. The huge map is the largest map provided by the game, but this has also been modded by some modders (I don't know it's dimensions). I have never heard of anyone reaching the maximum number of units or cities in the game (there must be a maximum but it's probably far too large to be reacheable).
At some point, the game will slow down if you start increasing the numbers. Some older computers will already have problems with huge maps in the late game (combined number of cities of you and AI in the hundreds (300?), combined number of units by you and the AI in the thousands or maybe close to ten thousands. The biggest problems are related to system memory (has to be more than 1.5 GB for late game huge maps, better 2 GB's) and video card (memory). The game will crash if you don't have enough system memory for the huge map.
If you want to mod the game so that you can play on much greater than huge maps, then make sure you have a great computer and an operating system that can manage a system memory greater than 4 MB's (a 64 bit operating system) to get optimal performance. I would first advice you to check out the huge map. It's large enough for the large majority of players, but there are mods out there that increase the largest map size and increase the number of players for those that want to play on even larger maps than those provided by the standard game.
I usually play on huge maps and the games already take a long time to complete. You'll get many dozens of cities (40+) and hundreds of units before the game ends and if you want to conquer the entire world, then you'll get hundreds of cities and many hundreds or even a thousand units.
I've found the mod that I was referring to:
XXL World.
The mod also mentions the dimensions of the largest normal map types and the added super large map types.
This game probably takes a bit more time to play than civ2 as the strategy is a bit more complicated. There are more choices to be made and it isn't that easy to expand quickly early.