Hi Chadli,
Sorry for the inconvenience.
However, this is all about your internet connection/speed issue. So, please check your internet connection/speed to fix the issue.
Also, you could follow the steps below.
1. Clean your full database “OR” reinstall a new WordPress with a new database
2. Then install the theme
3. Then install all of the required plugins
4. Then active all of the installed plugins
5. then import all of the demo data (wait until all of the demo data are imported completely)
Moreover, please learn more our support policy (item support includes & not includes), here https://www.themelooks.com/support/support-policy/ before post a topic or ask a question.
Best Regards,
ThemeLooks Support Team