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• facebook.github.io/jest/blog/2016/03/11/javascript-unit-testing-performance.html

  JavaScript Unit Testing Performance * JestMar 2016 - Overall this helped improve the runtime of all tests by about 20%.Here is an example of the same test run from before with better scheduling:Because we are running slow tests first, Jest can sometimes seem to take a long time to start up – we only print res..

• vimeo.com/47483575

  Javascript: Up To Speed on VimeoIn this single-episode production, Rob dives into the various aspects of working with "modern" Javascript. If you're a web developer and only dabbled with javascript - or if you're a .NET developer (*especially* if you're a .NET developer) - understanding J..

• blogs.msdn.com/b/ie/archive/2012/06/13/advances-in-javascript-performance-in-ie10-and-windows-8.aspx

  Advances in Javascript performance in IE10Jun 2012 - I am happy to announce that Visual Studio 2022 17.2 Preview 2 has experimental support for C++ modules in CMake projects. We’re excited to announce the release of an updated Surface Duo Emulator that is based on Android 11 and runs as an Android Virtual Dev..

• web.archive.org/web/20120617185850/antjanus.com/blog/web-development-tutorials/functional-javascript-front-end-performance

  Functional Javascript for Front-End PerformanceJun 2012 - Well, I’ve been scouring the ‘net and found really cool javascript code that will help you leverage some performance and modern-style coding into your website. jQuery Tools jQuery tools, with their really cool and inspirational logo , is a UI toolkit that w..

• broofa.com/2009/02/javascript-inheritance-performance

  JavaScript Inheritance Performance - Broofa.comFeb 2009 - One area of the Prototype javascript library that I have a bit of a love-hate relationship with is its support for mimicing OO inheritance. It’s fast but not very pretty, and it’s arguable whether or not this qualifies as real “OO” inheritance. Prototype-st..

• microsoftedge.github.io/videotest/2017-10/BenchmarkMethodology.html

  Browser performance comparison - JavaScript BenchmarksThe Microsoft Edge team ran the Google Octane 2.0 and Apple Jetstream 1.1 benchmarks on the latest versions of Microsoft Edge, Google Chrome, and Mozilla Firefox as of 12/1/2017: Microsoft Edge 16.16299, Google Chrome 61.0.3163.100, and Mozilla Firefox 57.0..

• web.archive.org/web/20101022061846/blog.yottaa.com/2010/10/using-web-timing-api-to-measure-page-performance-on-ie9

  Using JavaScript and Web Timing API to Measure Page Performance on IE9Oct 2010 - Optimizing web performance can increase web site traffic volume, provide a more engaging user experience and reduce operation costs. At Yottaa, we see the need to provide a best of class free offering that can match the commercial ones. This hack injects lo..

• johnresig.com/blog/javascript-benchmark-quality

  John Resig - JavaScript Benchmark QualityBrowsers keep getting faster at tests, test suites do the wrong number of iterations, causing the error level to continually increase: Whereas test runs 1-5 were independent, test runs 6-10 were not (they’re only being run due to the fact that previous test..

• lucidchart.com/techblog/2018/11/09/tracking-javascript-performance-zone-js

  ZoneTracker: Tracking JavaScript Performance with Zone.js - LucidchartNov 2018 - To ensure a great experience, we track frame rate and UI stalls. Tasks may be queued from setTimeout’s, XHR callbacks, keyboard or mouse events, etc… Here is my favorite in-depth explanation of javascript tasks. There is a great write-up of how Zone works i..

• blogs.windows.com/msedgedev/2018/06/19/improved-javascript-webassembly-performance-edgehtml-17

  Improved JavaScript and WebAssembly performance in EdgeHTML 17Jun 2018 - In every release of Microsoft Edge, we tune the Chakra javascript engine to provide better startup and execution performance, with a leaner memory footprint, and with improved responsiveness on real-world workloads. Previously, however, objects created by O..

• hacks.mozilla.org/2020/11/warp-improved-js-performance-in-firefox-83

  Warp: Improved JavaScript performance in Firefox 83Nov 2020 - With Warp (also called WarpBuilder) we’re making big changes to our JIT (just-in-time) compilers, resulting in improved responsiveness, faster page loads and better memory usage. The Optimizing JIT performs advanced compiler optimizations but has slower com..

• blog.sqreen.io/javascript-engine-performance

  Picking the best JavaScript engine for your Node app’s performanceKnowing which javascript engine is the best suited for running an application will become a useful skill in the future. The Ignition + Turbofan optimization architecture will definitely provide a performance boost. Even if it shows that Node.js is more powe..

• blogs.msdn.com/b/ie/archive/2014/10/09/announcing-key-advances-to-javascript-performance-in-windows-10-technical-preview.aspx

  JavaScript Performance in Windows 10 Technical PreviewOct 2014 - I am happy to announce that Visual Studio 2022 17.2 Preview 2 has experimental support for C++ modules in CMake projects. We’re excited to announce the release of an updated Surface Duo Emulator that is based on Android 11 and runs as an Android Virtual Dev..

• zoompf.com/blog/2014/06/apples-nitro-javascript-engine-available-to-all-apps

  Apple's Nitro JavaScript Engine Available To All Apps - Zoompf Web PerformanceJun 2014 - use strict" strict mode helps reduces some of the flexibility of JavaScript, but enables more accurate analysis of the source code making it easier to apply traditional compiler optimizations. This also impact performance testing applications, like MobiTest..

• iacoma.cs.uiuc.edu/iacoma-papers/pldi14.pdf

  Improving JavaScript Performance by Deconstructing the Type System

• developer.mozilla.org/en-US/docs/Web/JavaScript/The_performance_hazards_of_prototype_mutation

  The performance hazards of [[Prototype]] mutation - JavaScript | MDNPrototype]] mutation harms performance in all modern javascript engines. Internally to engines, a (simplified) version of these ideas looks like this C++: struct Property { Property* prev; // null if first property String name; // name of property unsigned ..

• v8.dev/blog/adaptor-frame

  Faster JavaScript calls * V8The whole point of this project was to remove the arguments adaptor frame, which offers a consistent interface to the callee when accessing its arguments in the stack. We just need to pop the number of arguments, pop the adaptor frame, pop all the arguments..

• github.com/sq/JSIL/wiki/JavaScript-Performance-For-Madmen

  JavaScript Performance For Madmen * sq/JSIL Wiki * GitHubCalling a single function but passing different types as arguments consistently deoptimizes that function in most runtimes. Sometimes inlining will mitigate this - the function getting inlined means the type information doesn't get messed up quite so bad - ..

• github.com/lodash/lodash

  GitHub - lodash/lodash: A modern JavaScript utility library delivering modularity, performance, & extras.Lodash is released under the MIT license & supports modern environments. Lodash makes javascript easier by taking the hassle out of working with arrays, numbers, objects, strings, etc. Lodash’s modular methods are great for:

• stackoverflow.com/questions/111368/how-do-you-performance-test-javascript-code

  How do you performance test JavaScript code? - Stack Overflow7 years later, I'll still repeat the advice of my original answer and point out that you can have slow code run forever where a user won't notice it, and pretty fast code running where they do, and they will complain about the pretty fast code not being fas..