What makes K faster than J.

I read on wikipedia.com that:

The small size of the K interpreter and compact syntax of
the K language makes it possible for K applications to fit
entirely within the level 1 cache of the processor. Vector
processing makes efficient use of the cache row fetching
mechanism and posted writes without introducing bubbles into
the pipeline by creating a dependency between consecutive
instructions.

Is this the reason K is so fast?  Would it be possible to
modify J to approach the speed of K?

Please don't flame me, just curious.
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