In reply to Sam B:
One lovely summer evening in the 1990s when the Slabs were deserted, I soloed Ordinary Route, Faith, Hope, Charity and Tennis Shoe, descending by the Ordinary Route each time. (N.B. The top pitch of Tennis Shoe seemed polished and insecure even then, wouldn't recommend this as a solo.)
Have no idea of the time. Wasn't in any kind of a rush but still moving fast, just for the fun of it. Would be surprised though if the time wasn't significantly faster.
However... there's a roughly equivalent route in the Mournes, a 500 foot V Diff slab route. It was my first lead; it took me all day and it was joyous. A day to remember always.
Subsequently, in the 70s, it was soloed in less than ten minutes and later on I used to really motor on it. What I found was that going against the clock, the experience seemed empty. Can't remember the times now but they were fast.
For me, going fast for the sheer fun of it was great; but logging the times killed it stone dead.
My last visit up FM took all day again (a novice, a very short rope and another person) but was also wonderful.
My feeling is that, whether fast or slow, sod the time and revel in the experience.
mick