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We were a parse user for (many) apps, and tried to run parse server briefly before just letting all the features built on it die.

I think one of the major instabilities not mentioned the request fanout. On startup the parse ios client code could fan out to upwards of 10 requests, generally all individual pieces of installation data. Your global rate limit was 30 by default. Even barely used apps would get constantly throttled.

It was even worse running ParseServer, since on Mongodb those 10 writes per user end up as a sitting in a collection write queue blocking reads until everything is processed. It was easier to kill the entire feature set it was based on.

I know there were a ton of other issues but I've forced myself to forget them.