My WPF Application use too much memory

My WPF Application use too much memory

I have a WPF application that contains 20 user control in Main Window.it
uses too much memory, about 400 Mb. I use story board to change the
position of text in all user control. and they give their content from a
web service. I wrote one story board in Cs instead of Xaml and my
application gets better but not very good!