The CMS collector, which you have turned on, needs lots of memory. If the CMS collector
ever gets behind in cleaning the tenured generation of the heap, a very expensive
"stop the world" collection takes place. I once forced the CMS collector to get
behind on a particular app and the garbage collection took around 5 minutes (using the
standard collector a Full GC on that same app takes about 2 seconds).
Also, do you have only one CPU? Never use the CMS collector when you have only a single
CPU.
Of course, without gathering any GC data, it is all speculation. What data have you
gathered so far?
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