How we made a Ruby method 200x faster

1. nokolexbor

   1 7 337 7.0 Ruby

   High-performance HTML5 parser for Ruby based on Lexbor, with support for both CSS selectors and XPath.

   

   You can also switch to Nokolexbor, our drop-in replacement for Nokogiri: https://github.com/serpapi/nokolexbor

   It should almost 1,000 faster for this kind of CSS lookups.

2. CodeRabbit

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3. HTML::Pipeline

   2 1 2,268 7.2 Ruby

   HTML processing filters and utilities

   

   You may also be interested in https://github.com/gjtorikian/html-pipeline (or its main dependency, https://github.com/gjtorikian/selma), for high performance HTML manipulation.

4. selma

   3 3 70 8.7 Rust

   Selma selects and matches HTML nodes using CSS rules. Backed by Rust's lol_html parser. (by gjtorikian)

   

   You may also be interested in https://github.com/gjtorikian/html-pipeline (or its main dependency, https://github.com/gjtorikian/selma), for high performance HTML manipulation.

5. Nokogiri

   4 24 6,179 9.5 C

   Nokogiri (鋸) makes it easy and painless to work with XML and HTML from Ruby.

   

   (2.1) Compare tagName in the selector

   Apparently Nokogiri implements CSS in a very inefficient way though by collecting ancestors and then converting the CSS into xpath and matching that:

   https://github.com/sparklemotion/nokogiri/blob/e8d30a71d70b2...

   https://github.com/sparklemotion/nokogiri/blob/e8d30a71d70b2...

   I'd expect that to be an order of magnitude slower than what a browser does.

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