RAM eating

Hello,

I've noticed that when a previous game is loaded, the RAM consumption of the game increases. 
If you repeat that multiple times it ends up closing the game by windows due to a total use of RAM. 
Surely it is due to the fact that loading does not kill the process of the previous game, 
since it seems more accused the more you advance in the game. 
It is not an annoying bug, but I report it in case it is of interest.
My computer is a laptop vaio windows 7 that runs decently the game.

A greeting

PD: Due to my mediocre English to express myself this is done with google, I hope there are not many inconsistencies.