If you store them in sqlite, how do you deal with redundancy / failover / scaling? There are other databases with better tooling for this, but they weren't part of this comparison. The world is full of tradeoffs. Scale and availability vs. microbenchmark performance is one of them. It would be very interesting to see a comparison of clustered MySQL or Postgres vs. Gluster or Ceph. I very much doubt the performance side of it would favor the database so much.