One of the biggest improvements reported by my users is the smart filtering enabled by default in ripgrep. That can't be contributed back to GNU grep. Also, pe

One of the biggest improvements reported by my users is the smart filtering enabled by default in ripgrep. That can't be contributed back to GNU grep. Also, people have tried to make GNU grep uses multiple threads. As far as I know, none of those attempts have led to a merged patch. There are a boatload of other reasons to be honest as well. And there's no reason why I specifically need to do it. I've written extensively on how and why ripgrep is fast, all the way down to details in the regex engine. There is no mystery here, and anyone can take these techniques and try to port them to another grep.