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whilst location may play some part, due to what route it takes.. i can't see it being the main reason..
i'm in uk, and my sites are in usa, and i also maintain another server hosted in the usa for a company in australia and they have page loads of only a few seconds..
http://72.29.75.243/~wwcncom/test2010/modules/newbb/ is located in usa (surpasshosting), try that site and see if it loads faster for you.. i know theres not much content, but as u say, even new sites were slow with globat..
your sites:
http://www.patioscordobeses.com loaded in less than 10 seconds for me.
http://www.tiroconavancarga.com/ took around 20 secons +
but the 2nd site does contain a lot of images/graphics on the homepage..
also, are you using a domain redirect? as i notice both domains are redirecting to
http://www.teselas.com/ which could also add a delay..
if possible set those domains to the nameservers DNS instead of domain forwarding..