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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. Mathias Bynens‏Verified account @mathias 25 Jun 2019
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      🚀 Perf tip: if your web app ships large JSON-like configuration as JavaScript object literals, consider using JSON.parse instead. It’s much faster, especially for cold loads! https://v8.dev/blog/cost-of-javascript-2019#json …pic.twitter.com/p0WICUm7zx

      69 replies 1,311 retweets 4,021 likes
    2. Devon Govett‏ @devongovett 25 Jun 2019
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      Replying to @mathias

      Interesting. We found that parsing large ASTs serialized to JSON (e.g. disk cache in Parcel) was faster using `new Function` instead of `JSON.parse`.

      1 reply 0 retweets 30 likes
    3. David Humphrey‏ @humphd 25 Jun 2019
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      Replying to @devongovett @mathias

      When we did processing.js we found the same

      1 reply 1 retweet 11 likes
    4. Rob Palmer‏ @robpalmer2 25 Jun 2019
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      Replying to @humphd @devongovett @mathias

      What is this witchcraft?

      1 reply 0 retweets 3 likes
    5. Tom Dale‏ @tomdale 25 Jun 2019
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      Replying to @robpalmer2 @humphd and

      It sounds like y'all may have encountered the same surprising results I described here?https://tomdale.net/2017/07/adventures-in-microbenchmarking/ …

      3 replies 10 retweets 61 likes
    6. Devon Govett‏ @devongovett 25 Jun 2019
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      Replying to @tomdale @robpalmer2 and

      interesting, thanks!

      1 reply 0 retweets 1 like
    7. Rob Palmer‏ @robpalmer2 25 Jun 2019
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      Replying to @devongovett @tomdale and

      So probably this is all just a misunderstanding and JSON.parse() is always faster than eval(). It also suggests the implementation of JSON.parse() could also be upgraded to similarly cache results for repeat calls of the same input.

      2 replies 0 retweets 5 likes
      Mathias Bynens‏Verified account @mathias 25 Jun 2019
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      Replying to @robpalmer2 @devongovett and

      You may have discovered the @v8js eval cache :) Have you tried to measure again in V8 v7.6 given https://v8.dev/blog/v8-release-76#json.parse-improvements …?

      11:46 PM - 25 Jun 2019
      • 9 Likes
      • Your Friendly Neighborhood Software Engineer joshisgross Oliver Hunt Minko Gechev YOLANDE Irène ⬡ Tempest ⬡ Maximilian Berkmann Alex A. Davronov 🇷🇺 Rob Palmer
      1 reply 0 retweets 9 likes
        1. New conversation
        2. Oliver Hunt‏ @ohunt 26 Jun 2019
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          Replying to @mathias @robpalmer2 and

          It always depressed me just how effective the eval() caches were -- people kept calling it a sunspider hack, but (especially at the point in history) the eval caches were hit continuously on so many sites.

          1 reply 0 retweets 2 likes
        3. Rob Palmer‏ @robpalmer2 26 Jun 2019
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          Replying to @ohunt @mathias and

          Maybe if cache hits like this we're surfaced as metrics in the DevTools, it would incite developers to eliminate the redundancy in their code.

          1 reply 0 retweets 0 likes
        4. 3 more replies

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