go play around in god mode while flying if you want to see the impact of many things at once - nothing like a 100 stack of Lox (tamed) spawned on top of a 100 stack of DvergrMage spawned in. Your graphics card will get heck of a workout while those attack each other. Fireworks ensue.

The inanimate objects have far less impact, but you can still see why there must be constraints for general use.