look all the textures and skins are loaded to the video memory
so the bigger video memory you have, more textures to load...
when you use purge function its remove it from video memory.
there is a lot of ways to make this process lighter(less memory) and quicker
read the manual
search for : predefines variables & pointers and look to enviroment and video subs...
there are some predefines that can free you video memory and make the loading quicker

and that last way is to change the resulotion. bigger res = bigger file;