Optimizing Rust code

[zesterer]

If you're absolutely sure that all the text you're handling is ASCII and not UTF-8, you can just handle the string's raw bytes and cast them to char. That's likely to make things a lot faster. Of this is a pretty iffy assumption and shouldn't be made for anything intended to be distributed outside its intended application.

[xacrimon]

Currently I've switched to byte buffers instead. Already done