Chat slows down after 350+ active chat users
When we reach 300-350+ users at a time in chat room. It slows down and takes few sec for new users to connect to socket.



Server Configuration : 
CentOS 7.4.1708
32GB RAM
Intel  Xeon E3-1270v6 - 4c/8t - 3.8GHz /4.2GHz
Nginx Latest Version.


Server Usage When we reach 350+ users is : 0.7/100
memory usage :  4%/100

Help me to sort this issue. Thanks
