[chrisplough]

Stefano,

This contention is a common performance problem for OTM customers and we've been doing a lot of projects around it lately. Usually, these issues are the result of Agent contention and require a detailed look at all of your OTM Agents in order to resolve. You want to ensure that you're not kicking off too many Agents at the same time that work upon the same business objects (orders, shipments, etc). The way the Agents are structured also has a lot to do with the overall performance and contention.

I know this is vague, but getting into OTM Agent optimization is a BIG topic. I hope that this at least points you in the right direction, though.

--Chris