you can assign a larger amount of memory to store preloaded animations into via the game properties tab.
I think animations are split into texture chunks - something like that - so they don't actually use/require as much memory as you would think.
SimonS explained how animations & textures work in a recent post, but I can't remember the name of the thread & there's currently no method for checking/searching for all posts of x member on the forum as far as I'm aware