zlib compression ben

level 	compressed size (%) 	time			compsize*time
1 : 	35.1988217968 			14.9458699226 	526.077012004
2 : 	34.09876469 			15.6917729378 	535.070072974
3 : 	33.539719275 			17.0555298328 	572.037682681
4 : 	31.7874425175 			22.7703402042 	723.810880346
5 : 	31.1262060052 			27.4812099934 	855.385803526
6 : 	31.0059811848 			31.3688042164 	972.620553323
7 : 	30.9398575336 			32.8289110661 	1015.72183137
8 : 	30.9338462926 			33.4694728851 	1035.33952972
9 : 	30.9338462926 			32.7950391769 	1014.47670106