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mathias's profile
Mathias Bynens
Mathias Bynens
Mathias Bynens
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@mathias

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Mathias BynensVerified account

@mathias

I work on @ChromeDevTools & @v8js at Google and on ECMAScript through TC39. ♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.

Munich, Germany
mths.be
Joined January 2007

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    1. Joachim Viide‏ @jviide 20 Dec 2018
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      Joachim Viide Retweeted Jason Miller  🦊 ⚛

      It was really great to work with @_developit 👍 We made some quite interesting perf findings along the way, like that first storing JSON.stringify in a variable boosted performance >20% - at least when run with Node.js v11.4.0 + MacOS 10.14.2 on a Tuesday.https://twitter.com/_developit/status/1075859975623331843 …

      Joachim Viide added,

      Jason Miller  🦊 ⚛ @_developit
      HTM 2 is here! 🎉 ⚡️ 20x faster (seriously) 🦄 Custom JSX parser 🤠 under 700 bytes 🤫 compiles to nothing http://github.com/developit/htm/releases/tag/2.0.0 … pic.twitter.com/vnUfuDeNqh
      Show this thread
      4 replies 14 retweets 136 likes
    2. Jason Miller  🦊 ⚛‏ @_developit 20 Dec 2018
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      Replying to @jviide

      @mathias figures it could just be down to skipping that property look up since we're doing it so many times. fun things :D

      1 reply 0 retweets 2 likes
    3. Joachim Viide‏ @jviide 20 Dec 2018
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      Replying to @_developit @mathias

      Ah, could it be the lookup for the JSON object itself? If I assign the global JSON object (instead of just JSON.stringify) to a module-scoped const the 20% perf boost is still there.

      2 replies 0 retweets 1 like
      Mathias Bynens‏Verified account @mathias 20 Dec 2018
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      Replying to @jviide @_developit

      Yeah, looking up a top-level lexical binding (like `const foo = 42`) is a completely different mechanism from loading a global property (like `JSON`). Then there’s the repeated JSON.stringify property lookup (which ICs would solve after the first hit for each location).

      10:19 PM - 20 Dec 2018
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      • Jason Miller 🦊⚛ Marvin Hagemeister ⚛️ 🇩🇪
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Mathias Bynens‏Verified account @mathias 20 Dec 2018
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          Replying to @mathias @jviide @_developit

          Still, a 20% difference seems a little surprising. How was this measured exactly? +@bmeurer

          1 reply 0 retweets 2 likes
        3. Joachim Viide‏ @jviide 20 Dec 2018
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          Replying to @mathias @_developit @bmeurer

          Clean clone of the htm repository. `yarn install` followed by `yarn test` to run the benchmark, noting of the "Creation" result. Replace src/index.mjs's stringify calls with JSON.stringify. Benchmark again. Edit code again to store JSON to a module-scope const. Benchmark.

          1 reply 0 retweets 1 like
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