Quote Originally Posted by Tactician View Post
It can't be the game only. Check for the running add-ons in the browser, applications and processes, and the resources they are consuming. There must other things consuming a good part of the RAM.

Also, your activity monitoring software seems to be a bit confusing. For example, the difference 644 MB vs 1.7 GB and 17.4 MB vs 2.2 GB. The two screenshots does not seem to correspond to the same system.
It's a fresh windows install, no add-ons on the browser, I find it weird to have "644MB in use" while the game is loading too.

btw, here's what happenes when you start the game:
Click image for larger version. 

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The game takes up to 2.3 GB ram to start