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> > Currently my pings to the Library of Congress from the UK is 78ms. > > However, we aren't talking about single (32 bytes?) ICMP > packets for > > SRW/SRU, but rather a chunk of XML over http which would typically > > take several TCP packets to send (so we would be looking at some > > multiple of 36ms/78ms plus overhead caused by different > packets taking > > different routes and packet re-assembly). So I would be surpised if > > typical network latency of an SRU request to the Library of > Congress > > from the UK was less than a few hundred ms. > From DK, I ping LOC in approx 105 ms . If I choose an > infrequent term, SRU search takes 250-500 ms (includes SRU > handling + search at the target). Had it been based on Axis > it would have been 700-950 ms. Right, so Axis is now adding a 100%-200% overhead which whilst not particularly good, isn't as bad as the 1000% hit indicated by Ralph's measurements. With a (more realistic) more frequent term, or more complex query I'd hazard the overhead would be around 50-100%. Again not earthshatteringly efficient but no where near as bad as the earlier figures suggested. Would be interesting to see how .Net et al perform against this too... Matthew