I'm profiling some code where it seems that caml_apply2 is right near the
top of the gprof list

  %   cumulative   self
 time   seconds   seconds    calls   name
 15.95      0.52     0.52 92467664   camlMutable_rack__has_letter_1031
 12.27      0.92     0.40 109589844  caml_apply2
 10.74      1.27     0.35 92467664   camlMutable_rack__remove_1035
  8.28      1.54     0.27  2478379   camlArray__iteri_1064
  7.82      1.80     0.26 32188972   camlMutable_rack__play_1040
  3.99      1.93     0.13 64437854   camlTrie__fun_76276

and seems (from the call graphs later down) to be contributing towards the
time taken by camlArray_iteri as well, unless I've misunderstood that bit.
Is this an actual problem, or just a sign that I've optimised all the
obvious bottlenecks already?

martin