For reference: S measures about 57mm, and L measures about 83mm.
Every knows that Hai Peng is the single fastest ship in the game. With a Helmsman and Captain, she can move S+L+S+L, a total distance of 280mm. Only, Hai Peng is no longer the fastest ship out there. I've found one better: HMS Gibraltar. Hear me out, okay? Her base move is a hefty S+S+S, but that only comes to 171mm, she's still 109mm off from matching Hai Peng. That's where Hermione Gold and Griffin come in. They add another S+S to HMS Gibraltar's move, totaling a single-turn move of S+S+S+S+S, or 285mm, just a hair faster than Hai Peng.
And if you add on Lord Mycron, you'll find that you can move a total of S+S+S+S+S+S+S+S+S+S in a single turn. That's 570mm, or close to 23 inches. Hai Peng can only move 560mm in a turn with a move action donated from Mycron.
Make no mistake: with only one more cargo space available, and no equivalent of Captain Jack Sparrow in the English roster, she's no game-breaking treasure runner. Instead, she's a lighting-quick interceptor, made more effective by Griffin's cannon roll boost. She's not big, but between her absurd speed, incredibly accurate guns, and free extra action, attacking from the right place may allow you to take an extra shoot action after moving and shooting, giving you firepower arguably better than that of HMS Gallows, another well-established powerhouse. Add on the 0pt re-roller and you've got pretty solid chances of 4 hits per turn with doubled shoot actions.
Her astonishing speed combined with her ability and one remaining cargo space means that she can fill the hold of her counterpart, Bloody Jewel, at least in theory. She can chase down any treasure runner out there, and has the speed and firepower to always have the advantage against some of the game's biggest ships.
I daresay that some smart play could make this ship capable of taking down San Cristobal, though a ship like HMS Endeavour may be a little risky, and El Acorazado would be a bad idea. Either way, anything capable of weathering an attack by Gibraltar is probably too slow to be any real threat to your gold runner, who is an alternative recipient of the extra action in moments of need. UTs that pose a threat are Odin's Revenge and Runes of Odin, both of which put Gibraltar at risk of sinking. As good as she is, her small size does force her to only engage if she has the advantage. Fortunately, she typically does, due to her speed.