[masklinn]

> If you're doing your own custom parsing you can write your own numeric parsers to remove support for parsing nan, inf, -inf, etc and drop scientific notation which will claw back a lot of the time.

The 200MB/s, at least for rust-csv, is for "raw" parsing (handling CSV itself) not field parsing and conversions, so those would be additional costs.

> If you also know the exact width of the date field then you can also shave plenty of time parsing datetimes.

Yes if you can have fixed-size fields and remove things like escaping and quoting and the like things get much faster.