Make sure to use microbenchmark tools

[hoatle]

Study and make a report about the available tools.

http://code.google.com/p/caliper/
http://labs.carrotsearch.com/junit-benchmarks.html
...

[hoatle]

http://www.javaspecialists.eu/archive/newsletters.jsp?category=Performance

[hoatle]

http://stackoverflow.com/questions/504103/how-do-i-write-a-correct-micro-benchmark-in-java/4480774