With dash 17 engines it was reckoned by some to be marginally quicker than the later Classics. But the high fuel burn killed it.
Also as the airframes aged, a performance penalty of up to 8% had to be applied to individual machines. The boiler plate reinforcing work around the roof and windows provided some clue to just how much more fuel would be guzzled to achieve schedule.
For all that, a great aeroplane!