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A seek on an NTX is faster than a seek on a CDX!  Why?

With the Btree structure, the leaf pages of the NTX are not compressed and
the leaf pages of the CDX are compressed.  It takes more time to process
(seek) on a compressed page.

If the NTX is small enough that all of it can be cached, then it will be
faster.  However even if this worst-case for CDX scenario, the difference
should be small.

In virtually all real-world cases, Comix substantially outperforms DBFNTX.