*Thanks all guys. The problem was solved with Appstats. *
**I thougth appstats need GWT, but I just forgot to add the servlet filter 
in web.xml =[  I am ashamed.
With appstats I discover too many JDO data calls being made unnecessary.
*
*
When I used the Visual VM to profile the application, it was right, the URL 
Fetch method is really slow off course, because is synchronous and make a 
request, spending more the 1000 ms. But it's not CPU expensive, so, the 
problem wasn't there.
*
*
Now my app is spending little cpu time of the quota. 

Thanks all, and I'm sorry about my mistake.
*
*

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