I looked up a little info about titanium. Less resistant to fatigue stress than steel, but about 56% of the weight. Larry's 727.9 becomes 407.6. Consider that f=ma, force equals mass times acceleration, switch it around to a=f/m, and you get 56% faster acceleration. Drop that a bit to account for the flint weight being the same, but that could be significant in terms of lock timing.
Hmmmm, where to get a custom titanium casting? For less than the cost of a new rifle, I mean.