Problem to understand compile report

Hey,

I am working with a existed application and I should like to reduce the initial download size.

For that, I see the compile report in order to know where/what I can do...

Do you know a tutorial in order to help me to understand the generated report ?

For example, I have a initial download size : 768 kBytes (this is too large!)

I see its detailed report, so 2 sections

Package breakdown and Code Type Breakdown

The total of percentage of Code Type Breakdown is 100%, but the total Package breakdown is not 100 %, why ?

The total Package breakdown is 33.1 %.

Where is the (100% - 33.1 %=) 66.9 % of code ?

Then, I see the Package breakdown : 

com.google.gwt.user.client.ui : 74kBytes : 11.2 % : I can do anything because this is google !

java.util : 41 kBytes : 6.3 % : I can do anything because this is google !

com.gr.client.core.refui.imageresources : 36kBytes : 5.4 % : this is my code, but 5.4 % is not too big, if I do something, this will not be great in my initial download .

com.google.gwt.lang : 34kBytes : 5.2 % :  I can do anything because this is google !

com.gr.client.application.remote : 34kBytes : 5.1 % is not too big, if I do something, this will not be great in my initial download .

How do you reduce the initial download size ? the procedure ? a tutorial ?

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