Is anyone aware of how much locktime is slowed on a COC or how much the trigger is effected by COC?
Ya know, I don't think that the COC vs COO thing has much to do with lock time. Look at the COC rifles of note - the Enfield and the small ring Mausers. They both hail from the end of the 19th century, and both sport a lock time in the 4-5ms range. They both have long, heavy firing pins and relatively weak firing pin springs.
Now look at the prototypical COO - the large ring Mausers. They, too, hail from the late 19th century. They also have long, heavy firing pins and relatively weak firing pin springs, and they too have a lock time in the 4ms-5ms range. Other Mauser-style actions of the early 20th century (03 Springfield, 1914/1917 Enfield) also have similar lock times. I believe that the prevailing emphasis of the day was on reliability and rate of fire; increasing the firing pin spring tension directly increases the force needed to work the bolt, and decreasing the firing pin weight likely had negative impacts upon reliability.
It's not until you get to more modern bolt-actions that you begin to see a trend towards lightening the firing pin (primarily via the use of more advanced materials), shortening its travel, and increasing the firing pin spring rate - all designed to shorten lock time. In my mind, the primary lock time issue is one of age and technological knowledge, not one inherent to the design itself.
Now let's put this in context. If I recall correctly, the average new-production Win70 has a 2.5ms-3ms lock time, the Rem700 around 2.5ms, and a new-production Ruger 77MkII will sport a 4ms lock time. This means that the Enfield and small-ring Mausers and large-ring Mausers and Springfield '03s and Enfield Model 1914/1917s will have a lock time between 1ms and 2ms greater, on average, than a stock sporter.
But I firmly believe that if Tubbs made a lightweight firing pin for the small-ring Mausers or Enfields, they'd be more than competitive in terms of lock time with the best of today's sporters. I'm also not convinced that lock time is as much of an issue for field use than it is for the bench racing crowd....