Re: [Haskell-cafe] Efficient functional idiom for histogram

My measurements show that - using strict version of insertWith doesn't improve performance. - in case of compilation with -O2 flag foldl' also is equal to foldl (-O2 gives approx 2 time impovements).- using RandomGen and State monad to generate a list gives at least 4 times improvements (on 1 000 000 items). More complicated improvements (using Array, PRNG and so on) were not tested by me.