Hi tinhbeng,
I contacted the server and he said:
"
As far as the site loading slow, there doesn't appear to be an issue with the server or services. However your scripts are not efficient and slow: gtmetrix.com/reports/industriagroup.eu/9yBKZx18
As far as the jquery and css, that is a script related issue. You would need to consult your web developer for the scripts.
Can you provide proof that it is a hosting/server issue? And if so, with what specifically? The information you have provided only relates to scripts. The information you have provided only relates to scripts. Show me something that is a hosting issue.
"
How can I solve the problems ?