Development have looked into this problem and you must understand that “CloneCD” and “Alcohol” are two different programs, it is difficult to compare the two.
As far as speed and CloneCD goes:- CloneCD only guesses the end of the bad sector areas tricking the CD to be read faster. This is why you have the faster read times.
Whilst it can get away with this on present protections it may not necessarily be the case with up and coming protections. ( also this method of guessing the end of the bad sectors is not 100% fool proof as it could lead to some data loss )
Alcohol on the other hand, reads all the bad sectors to ensure no data loss, although this does lead to a slower read speed but also gives more accurate data control.
The development team can implement the same method used in CloneCD but at the moment there are more important Options that are being developed for Alcohol, so this option is low down on the priority list at the moment.
But it will be implemented for those that wish to use it, in a later release of Alcohol.