Well, the "clippers" at sea were known for their speed, so maybe something along those lines? Perhaps this new configuration allowed for better (Insert warpy fluxy field technobabble here)
), and broke the "Warp 3 threshold", etc.?
(Since NX-01 broke the Warp 5 barrier, IIRC from ENT, and it had a saucer, that's why I came up with the "Warp 3 threshold".)
Cheers & TGIF,