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No. Less stiff if anything.

This explains the main motivations for compact geo.

Not mentioned is the slight comfort benefits you can get with a long exposed carbon seatpost.

Yeah that's what I'm saying, the mash frame reduces seatpost flex but the frame is less stiff.

Having both anti compact and compact I can concur the anti compact is murda. (faster)

As much as I admire your courage for coming in here and admit you have a Mash I really doubt this somehow. Is your other bike a Vigorelli perchance? A direct comparison between the two might convince me.