Like any server, PopChart Server can only accept a certain number of client connections at any given moment. When the number of connected clients has reached a maximum value, it starts placing client requests in a queue, and responds to them as soon as another connection becomes available. Most of the time you don't notice this behavior because PopChart Server rarely spends more than 50 milliseconds dealing with a client request.
In some cases, you may find that you want to increase the maximum number of connections so that clients spend less time waiting in PopChart Server's queue. In other cases, if the responsiveness of your site is decreasing, you may actually benefit from decreasing the maximum number of connections. The reason for this is PopChart Server will spend less time managing connections and more time generating images.
You can change the maximum number of connections in the Settings > Cache / Connections section of the Administration Console. Simply enter the desired value in the Maximum Connections box.
The default setting allows PopChart Server to accept an unlimited number of connections.
You should tweak with this setting only if you are experiencing performance problems. We suggest you start by allowing 25 connections, and then raise or lower this number until you see the best performance results.