Memory use AX2012 client on Terminal Server

On the terminal servers (W2008 R2, 64 bit) the AX2012 client is using a lot of memory. I was wondering if this is common or if there's a solution.

In AX2009 the memory use is 40 to 150 mb for a client, depending on what’s the action.

In AX2012 the memory use starts from 100 to 400 mb. Most people using AX2012 are using 200 mb or more.

This is deadly for our Terminal server Citrix installation.

Could someone explain to me why AX2012 is consuming this amount of memory?

Many thanks

Greetings Bart