groovy_loosies/benchmarkIt.groovy

def benchmark(int count, Closure worker) {
  def start = System.nanoTime()
  count.times { worker(it) }
  def stop = System.nanoTime()
  return stop - start
}

def intCast = benchmark(500000) { (int) it / 2 }
def intMeth = benchmark(500000) { it.intdiv(2) }

println "Integer cast: ${intCast/intCast * 100}%"
println "Method call:   ${(intMeth/intCast * 100).toFloat().round(1)}%"