My comfortable cadence is slowish, i guestimate 60-70rpm. In response to all the high cadence recommendations that I have read here and there, I gradually began spinning faster while commuting. But I did not see any real difference in my time, in fact it was up if anything. Then one day I geared up a bit, spun slower and whoosh! knocked quite some time off my commute. It was then I remembered that slower pedalling did allow me to concentrate more on a smooth stroke rather than spinning just for the sake of it.
Since then due to wear and tear issues I built a singlespeed for commuting which forced my cadence down a lot (on the uphills mainly). My leg power has increased tremendously since then, fitness is still good and I am enjoying it.
Also, I have been setting times for riding up a popular training hill, and with high cadence, have posted poorer times than with lower cadence. It seems to me I simply wore myself out with all that spinning rather than generating lifting power.
So how about it? Is higher necessarily better?