Thank you for checking this, and determining it didn't actually apply in this case. We do a lot of I/O intensive Rust at work, and I have a list of things to d

Thank you for checking this, and determining it didn't actually apply in this case. We do a lot of I/O intensive Rust at work, and I have a list of things to double-check when benchmarking. The most common slowdowns: debug builds, unlocked stdio, line iterators, and anything else which allocates in an inner loop. If I can hit 250 MB/s throughput per core on my laptop, with some light data processing, I'm usually quite happy.