I think it is not configured properly, and I need more information to identify the problem, output of "top", "netstat -an | grep ESTABLISHED",
and content of lsws/logs/error.log lsws/logs/stderr.log, Real time report page in admin interface.
If you can make the admin interface available to me, I can take a look.
There are some configuration you need to tune for the best performance in production environment:
Turn on "Smart Keepalive", set "Connections soft limit per client" to "10",
Also turn off MySQL persistent connection in php.ini