Performance for my workload (writes/reads for a relatively small number of large documents) was absolutely atrocious.

To the point that retrieving data based on a secondary index (of like 10000 documents) took like 5s.

Then inserting the same documents took a significant (don’t remember the exact magnitude) amount of time as well.

By comparison mysql does the same stuff in 50ms (or less).

Everything around RethinkDB was fantastic, but I just couldn’t justify that since the basic operation was so terrible.