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Trying to determine if a fast boat can economically (fuel wise and part wise) operate at slow speeds is rather hard.
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No, it's not hard. But first you need to define what "economically" means. Some depends on the engines, a lot depends on the boat.
My big fat Hatteras was designed to run on "plane", (theoretically about 14 knots) but we virtually never did. 8-9 knots wuz us. We ran it up at the end of the typical day for about 10 or 15 minutes. Engines surveyed out beautifully after 2000+ hours of running that way. I know a lot of other Hatteras MY owners, and all but one run it the way I described.
Sunchaser described the whole turbo issue quite well. You could subscribe to boat diesel.com for more detailed info.