Maybe they have a separate convolution reverb on every sample group? Who knows, but it's a pig, plain and simple. It's not just the sheer number of voices playing (which IS excessive for something as non-critical as a guitar drone texture), because I've got many of my home-brewed instruments that have no user interface or scripting but can play dozens of voices with much less CPU load - so I'm not exactly sure what's going on under the hood of instruments like that to cause such a heavy load. I don't know if it's because of poorly-optimized code in the Kontakt scripting engine itself, or overly complex scripts created by the library developer, or what - but playing one note on this thing will load up Logic's last core all the way to the top. This library has a fairly simple user interface that lets you use five or six knobs to control the mix between a bunch of layered textures, and then go to a second page for detailed tweaking of eight or so individual stereo samples that are all playing at once. Late at night, bored and inundated with half-off sales emails, I purchased a library called Dronar Hybrid Guitar Textures. NKI file is provided and various combinations of the sample content are deployed from within that interface) can tax the "last core" in Logic all the way to the limit on my 12-core cylinder. I've seen a trend from some developers of Kontakt libraries lately - some instruments with ridiculously complex user interfaces and the "one instrument" approach (where a single.
One thing to keep in mind is that the current 6-core has a MUCH faster clock speed than the current 12-core (3.5gHz versus 2.7gHz), so I'm sure this helps in many circumstances like the following:
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