NNTP Application Processing Time
The NNTP Application Processing Time exceeds the critical value set in Expert Thresholds. "Application Processing Time" measures the time spent waiting for the application or server, as opposed to network latency. Network Latency plus application processing time is referred to as Session Delay, which is tracked by a separate Expert Threshold.
Possible reasons for the event:
There is a hardware or software problem at the application end. Perhaps the news server hardware is overloaded with disk I/0 requests, or some other system component (for example, the CPU or NIC) is too slow given the traffic it is expected to handle.
There are many strategies for limiting the system resources that an NNTP server is allowed to consume. For example, you can delete newsgroups from your server or shorten the expiration policies for particular newsgroups.
If you do not want to limit your users' access in such ways, and still want to improve performance, you may want to set up virtual (also known as slave) NNTP servers that cache articles locally. The virtual servers all connect to the master server, but not too each other. You can then use round-robin DNS, a load balancing technique that assigns multiple IP addresses to the same DNS name.