Insightful Reddit comment https://old.reddit.com/r/rust/comments/1al8cuc/modular_commu...
> The TL;DR is that the Mojo implementation is fast because it essentially memchrs four times per read to find a newline, without any kind of validation or further checking. The memchr is manually implemented by loading a SIMD vector, and comparing it to 0x0a, and continuing if the result is all zeros. This is not a serious FASTQ parser. It cuts so many corners that it doesn't really make it comparable to other parsers (although I'm not crazy about Needletails somewhat similar approach either).
> I implemented the same algorithm in < 100 lines of Julia and were >60% faster than the provided needletail benchmark, beating Mojo. I'm confident it could be done in Rust, too.