And this is getting nauseating even to these wanting to give it a try. I'm in the step of walking away and forget about it until the dirt settles down (and it becomes at least as fast as C/C++ or... even Go)
Rust should be roughly the same, speed-wise.
Since you chose to be cute, I'm going to take a guess that you think this means the comparison between the tools is unfair. If that's an accurate interpretation, then I will say that your question is irrelevant because ripgrep is faster or as fast as GNU grep on benchmarks using a single thread too. In fact, that's the whole point! It says so right in the project's README.
Optimization tricks in Rust are the same as you'll find in C++. It might be worth you comparing the C++ implementation of Snappy with my Rust implementation, for example. You'll see the same kinds of tricks employed in C++ as in Rust (avoiding memcpy in favor of unaligned loads/stores).