This claims 3gb/s, saturating nvme full queued read. It’s not clear if they construct data or just parse it, but you have to construct data with any format. Other libs also do a great job. Also, io latency shoud be accounted for, because average jsons usually fit into one sdd block, afaiu.

https://lemire.me/blog/2020/03/31/we-released-simdjson-0-3-t...

(Edit: just realized this is the same site as subj, heh)