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LeeD said..
Opinions aren't worth much unless you've sailed Coyote Pt. on an ebb tide.
I have..at least 50 days.
Port Tack, you run straight into knee high windswell...talking 20 knot breeze..what a non surfer would call THREE FOOT waves, because the face is 3' laid at app. 30 degrees.
Slalom boards wet up to their mast tracks momentarily, slowing the board down every swell you encounter.
FSW has full rocker, less bottom exposed to inconiming windswells, don't get slowed by chop.
Hence, similar speeds.
Flat water like Oz has, full on slalom boards would be 4 knots faster than FSW, for sure.
We don't sail flat water spots in Calif anymore.
Opinions aren't worth much unless you've sailed the latest modern slalom boards.

I was shocked at the difference between my 2008-2010 and my new Starboards in moderate chop.

Huge difference!

Of course there are conditions where an average sailor on a FSW will be more comfortable, or simply able to be kept under control, and therefore relatively faster. But it's the exception rather than the rule.
Videos. especially onboard, wide angle, make the roughness very deceptive, but I can tell looking at this that board and sailor are not struggling/out of control. Therefore talk of FSW boards being an advantage in that situation does not seem very relevant.
Beam reaching speeds in moderate, open water, organised chop typically varies between 20 to 25 knots, depending on the wind strength in my experience, a bit higher for the very skilled. If it is safe to go broader, low to mid 30's is achievable by most, and peaks in the mid to high 30's by the very skilled.

In pyramid, mixed direction backwash or confused chop, nothing is really fast. Sailable maybe, but not fast.