I have a new install in a virtualized box. A OVH (So you start) server with Proxmox 4.2, Debian 8.5, the containers are LXC.
The main host is a Intel(R) Xeon(R) CPU E3-1245 V2 @ 3.40GHz, 8 cores, 32GB RAM.
The virtual container has a fresh install of Ubuntu Server 14.4 with Imscp 1.2.17.
The panel has only one site running, with a Drupal 7 site.
When I try to access a page it takes about 7 to 10 seconds to load. The cpu load increases to 2.00 or 3.00 in the container and the main host.
Accessing to a cached page is very fast.
Watching the processes I see php5-cgi and mysqld that are on top.
I've tested both php-fpm and fcgi.
I'm thinking that I there is a bottleneck in somewhere but don't know where is the problem.
I have other server with an old ispcp panel but similar hardware, with about 20 sites running and I don't have any similar issues.
Any idea of what is the problem?