It seems like an entropy daemon like "haveged" ( can significantly reduce Tomcat start up times.  Java uses /dev/random by default to initialize seed generators.  Problem is, if the entropy pool on a machine is depleted, /dev/random will block until enough environment noise has been gathered to generate sufficient entropy. haveged helps keeps the entropy pool filled up.
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Expert Comment

by:Brandon Lyon
This is another example of why backends can be hard to get right and are more difficult than they seem. There are so many important minor details.

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