comparing GWT and jsp apps - why javscript apps different from html apps

I had fairly large application developed in early web days , now I
want to convert into GWT.
Obvious we have added value of AJAX, what else do I loose?

1) large java script , initial down load time
=> why is this , both and HTML and Javascript are different ways of
telling how the window is to browser.
meaning Are browsers more efficient in parsing and rendering
than javascript ?
=> With we only load URI , why do we load entire java script ?
Just like only "index.jsp" to loaded javascript also should
index.javascript, why every thing?
With GWT.runAsync - seems like a good Idea. But not sure, why
java script can not be divided like pages (URI) ?

At the end both java script and HTML build DOM for window
rendering, why browsers are more friendly with html than java-script ?
GWT+GAE is really cool - if we can reduce these difference

-Venu
http://schoolk12.appspot.com/

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