[C19fan]

I was reading the Wikipedia entry the frigate took 11 days to cross the Atlantic when the Blue Riband holder for fastest crossing was 9 days and 16 hours.

[BroJoeK]

c19fan: "...the frigate took 11 days to cross the Atlantic when the Blue Riband holder for fastest crossing was 9 days and 16 hours."

From 1856 until 1863 the "Blue Riband" (not called that at the time) was held by Cunard's SS Persia, a 3,300 ton paddle-wheeler, which could do 13 knots.
Persia was nearly 100 feet longer, 1/3 less weight and 80% more powerful engines than the Russian warship.
But General Admiral could do 12.3 knots which was as fast as the fastest civilian ships as recently as 1850.

SS Persia: