Of course it's slower. CFD simulations would also prove that. But maybe they wanted not to be too many world records be broken, to damage control the apparent

Of course it's slower. CFD simulations would also prove that. But maybe they wanted not to be too many world records be broken, to damage control the apparent doping problem. You can easily see on TV now, who is doped and who's not. All the dopers do have dark purple faces after the swim, usually the middle swimmers from the US, GB, AUS, Ireland, F, China, whilst the non-dopers keep their usual skin color. Italy, Hungary, Germany, ... Some hormone effect probably with these rushes.