As to what concerns the most deadly builts out...

[WarBlade]

You thought about calling yourself WarDagger? Would be just as nice!  :P  :D

No

Barbarians for Boss Monsters only? Did they lose their capability of killing masses, e.g. with whirlwind?(let's not assume being in the Chaos Sanctuary)
What about an Assassin? Are there builts who can level as fast as OrbSorcs or Bowzones/Javazones?
A Druid with Fury? Or is perhaps the skill Maul in bear form devastating, perhaps after stunning with shockwave?

I never said a number of things that you apparently think I did.

"Barbarians for Boss Monsters only?" and just below, "I disagree that Palas and Necros are capable of so fast leveling than other classes" are products of your imagination. You might want to read those parts more carefully before forming responses for them.

Anyway, Assassins aren't particularly fast in Hell level. Fury wolf Druids rock Nightmare, but the PI's in Hell mean levels where he basically shifts into first gear and wombles through at a snail's pace. A PI LEB can be begging for parking manoevres in those places. Maul and Stun? Not a very quick run through Hell I'm afraid.

What I wanted to know is: Which builts of which classes have GENERALLY on the HIGHEST difficulty level the power to slay more monsters faster than the other builts?

There is no "fastest".

. . . and despite all the definitions you supplied monster desity plays a huge role in the case of the Amazon who can exploit a tight pack like no other.

*sigh*

Just take an Amazon. :blink: Lightning Fury, Freezing Arrow and Immolation Arrow should give you the cheap boredom you're going for. <_<