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When enabled, the Server Status tool can be accessed at the following URL:
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You will get to see something like below:
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If all available slots display characters like "K" or "W", it this indicates a problem ; — the server is getting clogged. The list of requests will give you a hint where to start looking for the source of this the problem. Most likely some ' slow ' URL is popular and gets requested often. From there you can devise strategies to avoid that URL from (a) being slow or (b) being called requested so often. Either strategy will lift relieve some of the load of on your server.