[rikkipitt]

I've recently discovered jemalloc, specifically when used with Heroku.

"Using jemalloc instead of regular malloc helps too. The exact way to do this depends on the platform you use, but it is pretty simple on Heroku. Just set heroku-buildpack-jemalloc as the first buildpack (ahead of the heroku/ruby buildpack)."

FYI, remember to set JEMALLOC_ENABLED=true in your env to actually turn it on.

https://github.com/gaffneyc/heroku-buildpack-jemalloc