An interesting observation. No bike is "fast" but some are more aero than others. However, no matter how aero the bike is, unless you can get into a - relatively uncomfortable - proper TT position which is low (flat back) and narrow, plus be race fit, all the money and bike in the world will not produce any results that could be described as a spectacular improvement. Sorry about that, it's hard graft and pain that generates speed, and once the optimum performance is reached, maybe consider what some describe as a "fast" bike. Just don't get taken in by the advertising and some of the wind tunnel stuff, the real world is very different, surfaces, hills, corners, crosswinds, all of which call for fitness and good bike handling! The "fast" bike just completes that package once performance peaks.