High load average, low CPU usage – why?

With some further investigation, it appears that the performance problem is mostly due to a high number of network calls between two systems (Oracle SSXA and UCM). The calls are quick but plenty and serialized, hence the low CPU usage (mostly waiting for I/O), the high load average (many calls waiting to be processed) and especially the long response times (by accumulation of small response times).

Thanks for your insight on this problem!

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