i've been having some issues with EC2 too.  Are you actually paging from
memory to disk or just using the WAL for durable memory?  you can use a
different walMode to make it "better". 
I was playing with 
        <property name="walMode" value="BACKGROUND"/>
        <property name="walFlushFrequency" value="10000"/>
Which means it flushes the wall every 10 seconds in the background

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