That's definitely a bug. Hmm.. I don't know why it would be. Which OS? I would be happy if you could profile the javascript to see what is up with that, but should be on a dev build. Open an issue at https://github.com/emnh/rts-reasonml/issues so we can communicate on it if you are interested. A dev build is at http://emh.lart.no/publish/rts-reasonml-dev1/ .
