MongoDB 4.4 seems to be a lot slower in data load and queries (percona.com)

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[ 3.4 ms ] story [ 25.3 ms ] thread

There is also bunch of other interesting data - MongoDB 4.2 seems to have quite a regression going from single node to Replicaset while 4.0 does not.

Interesting

4.4 is still a release candidate not a production release.

Yep it is. The article mentions that. Note though there is quite a regression between MongoDB 4.0 and MongoDB 4.2 too.

Very interesting article.