Hmm, I tried with GHC 6.10 and the python dicts are still faster. I'm told that the judy array on hackage is the way to go for mutable maps but I haven't tried

Hmm, I tried with GHC 6.10 and the python dicts are still faster. I'm told that the judy array on hackage is the way to go for mutable maps but I haven't tried it personally.