Plenty of factor why your Drupal website load very slowly. I visit your site and your website is very slow. Are you using shared hosting ? What is the maximum php.ini of your server ? If you are using plenty of modules without proper balances to the server this cause slow down to your page loading.
Using to much script that is not compatible to your server is also one common errors.
One way to speedup is use cdn.
If you need further assistance email me or set an appointment and time so we can talk in the voip or phone.