I have a local development server in the local network. There are many instances of magento sites running there.
Developers work a 5-6 different magento's and when there is such use the server responds very very slow and often gives a 503 error- Site Temporarily unavailable.
I am using apache web server with mysql.
The network is good enough to bear the magento requests going through the local network, also the CPU, RAM and resources usage are okay.
I have checked the log files, access logs and so on, but the server is very slow in response. It takes up to 20-30 seconds often to load a magento page.
also, the mysql service takes a long time to restart.
I am using
Ubuntu16 as my server