GWT application runtime memory size is too large (client side)

I have written quite a sophisticated gwt application (many different views, combined with highcharts). Since ios6 I have observed that sometimes the application crashes in safari. After debugging for quite a while I read somewhere that safari limits the memory size to 10MB. Therefore I used the profile function of chrome to take a heap snapshot. The result is that my application has a size of 9.55MB (!!). Sometimes it seems to exceed the 10MB and then the safari browser crashes.

Therefore I obviously need somehow to shrink the size (it is about runtime memory size). Any suggestions :)? Or is the conclusion somehow, that GWT is not suitable for "very large" applications? 

P.S.

I have not discovered any memory leeks in the application.

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