p:\test>Bench
             Rate describe1 describe2 describe3 describe4
describe1  5186/s        --      -28%      -76%      -78%
describe2  7232/s       39%        --      -66%      -70%
describe3 21387/s      312%      196%        --      -11%
describe4 24048/s      364%      233%       12%        --