I've run a lot of numbers courtesy of the trusty flight touch app on my i Pad and come to the conclusion you may be right.......Damn plastic Jet.
The Bus is around 6,000' lower each nm on average and about 17 kts slower on average as a result. The 25 kts faster speed above 32000' would probably be lost lower down later.
Next trip I'm delaying my descent to 3 x profile!! Then I'll get ya
Until ATC screw my plans!!