Piwik is slow on a clean install on Debian with Apache2+PHP5

Piwik is slow on a clean install on Debian with Apache2+PHP5.
I recently installed piwik on my server, but when i log in and when I try to use it, it takes several minutes for UI elements to get loaded…

Hello
see: Piwik is slow! It takes a long time to load widgets, reports and pages. - Analytics Platform - Matomo

Hello,
I read the FAQ before posting.
The first two points don’t aply because I don’t have any websites added yet… And I don’t think I’m using NFS…