Hey Miguel,
Since the site is not public, then don't post access credentials in a public forum
So I had a look at the site and I can't see any performance issues. I see that the google map loads at around 3s, then once loaded 2s later, we send the first request for fetching data from the database. The response takes 400ms to complete (327ms waiting and 74ms receiving)
I see that you are zooming the map on the users location. We use a web service to match the user IP to lat and long coordinates. Can you turn this thing off - is the loading of the map faster for you then?
Regards,
Daniel