After spending hours and hours learning PHP and MySQL fundamentals :( we found the main problem which caused the slow website loading time. We removed all the wordpress plugins, made a cleanining job inside the database and reinstalled only the most important plugins. Now things should work better.
Our hosting server is still not fast and responsive enough for the ammount of people who visit us daily. We hope to get enough money from google advertising programm and free donations to upgrade to a better service.
Really, it was a frustrating job, Marwin sleeps an I go out to take some photos with my camera. I miss to play real photography!
Marwin and Alejandro