Okay, the Array >> #do: comes down to Number's:

to: stop do: aBlock 
	"Normally compiled in-line, and therefore not overridable.
	Evaluate aBlock for each element of the interval (self to: stop by: 1)."
	| nextValue |
	nextValue := self.
	[nextValue <= stop]
		whileTrue: 
			[aBlock value: nextValue.
			nextValue := nextValue + 1]

And the LinkedList >> #do: is:

do: aBlock
	| aLink |
	aLink := firstLink.
	[aLink == nil] whileFalse:
		[aBlock value: aLink.
		 aLink := aLink nextLink]

So Array iteration has the incrementation of 1 in each iteration. That makes
the difference? I thought that #to:do: is optimized as it does not appear on
the stack... :)

Best,
Marcel



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