A very useful means of analyzing DataPower transaction latencies are the Latency log records (at information level), here an example:
... mpgw (coproc2xform) Latency: 0 17 0 17 20 14 11 20 22 20 22 513 0 20 17 17 [http://126.96.36.199:2223/]
Paul Glezen created cool "dpShowLatency" tool, a Mozilla Firefox add-on for analyzing IBM DataPower latency log entries. The add-on is available at:
This is how the above latency record displayed, after a nice animation finished:
These are the two relevant "Latency messages in DataPower appliance" technote/blog posting links mentioned above in the tool:
This related technote is useful too: "Troubleshooting DataPower: How to Set Up A Local Latency Log Target"
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