SecureRandom sr = SecureRandom.getInstance(args[0], args[1]);
for(int i = 0; i < Integer.parseInt(args[2]); i++)
    sr.nextBoolean();

args: SHA1PRNG SUN 1000. result: 0.1s
args: PRNG SunMSCAPI 1000. result: 5.6s

Find this while evaluating 6445557.