Finally, my conclusion is that my problems was in the apache load balancer. It some times (when i suspend my laptop) doesnt work well and when i restart it everything goes fine.
But it´s corious because it works fine with iexplorer, but with firefox it goes very very slow. The apache load balancer and firefox doesnt like very much each other :). If I make the request against the instance of the cluster with the firefox goes fast but through the load banlancer.....goes very slow...
So by the moment, i will continue working with iexplorer :)
Regards,
Alberto
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