PR copy aside, the claimed performance differences relative to RocksDB and WiredTiger are typical of many storage engines, the performance doesn't stand out. I don't think either RocksDB or WT has made a serious claim to prioritizing performance in their designs in any case.

Also, I have to wonder how narrowly "open-source storage engine for SSDs" is being defined here such that it excludes so many earlier storage engines in claiming the title of "first".