Comment by rurban

I still use a 10x faster lexer, RE2C over flex, because it does so much more at compile-time. And on top of that has a bunch of optimization options for better compilers, like computed goto's.

Of course syscalls suck, slurping the whole file at once always wins, and in this case all files at once.

Kernels suck in general. You don't really need one for high perf and low space.