JS Self-Profiling API In Practice
Nic Jansma (@nicj) is a software developer at Akamai building high-performance websites, apps and open-source tools. Table of Contents The JS Self-Profiling API What is Sampled Profiling? Downsides to Sampled Profiling API Document Policy API Shape Sample Interval Buffer Who to Profile When to Profile Specific Operations User Interactions Page Load Overhead Anatomy of a Profile Beaconing Size Comp
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Stoyan Stefanov (@stoyanstefanov) is an ex-Facebook and Yahoo! engineer, writer ("JavaScript Patterns", "React: Up and Running"), speaker (JSConf, Velocity, Fronteers), toolmaker (Smush.it, YSlow 2.0) and a guitar hero wannabe. Happy 25th birthday CSS! Yes, today marks 25th year of CSS’ existence. Source. Contrary to what some may have you believe, CSS is not the worst. CSS is lovely, CSS is empow
The performance effects of too much lazy loading | Articles | web.dev
The performance effects of too much lazy loading Stay organized with collections Save and categorize content based on your preferences. Lazy loading is a technique that defers downloading a resource until it's needed, to conserve data and reduce network contention for critical assets. It became a web standard in 2019 and today loading="lazy" for images is supported by most major browsers. This pag
Resource inlining in JavaScript frameworks | Aurora | Chrome for Developers
As part of project Aurora, Google has been working with popular web frameworks to ensure they perform well according to Core Web Vitals. Angular and Next.js have already landed font inlining, which is explained in the first part of this article. The second optimization we will cover is critical CSS inlining which is now enabled by default in Angular CLI and has a work in progress implementation in
JavaScript performance beyond bundle size
23 Feb JavaScript performance beyond bundle size Posted February 23, 2021 by Nolan Lawson in performance, Web. 8 Comments There’s an old story about a drunk trying to find his keys in the streetlight. Why? Well, because that’s where it’s the brightest. It’s a funny story, but also relatable, because as humans we all tend to take the path of least resistance. I think we have the same problem in the
How Shopify Uses WebAssembly Outside of the Browser
Opens in a new windowOpens an external siteOpens an external site in a new window On February 24, 2021, Shipit!, our monthly event series, presented Making Commerce Extensible with WebAssembly. The video is now available. At Shopify we aim to make what most merchants need easy, and the rest possible. We make the rest possible by exposing interfaces to query, extend and alter our Platform. These in
ArmにあるというJavaScript専用命令とは何か、あるいは浮動小数点数を整数に変換する方法について - Qiita
// gcc-10 -march=armv8.3-a arm-jcvt.c という風にコンパイル #include <stdio.h> #include <math.h> #include <inttypes.h> #include <arm_acle.h> // Prototype: // int32_t __jcvt(double); #if defined(__GNUC__) __attribute__((noinline)) #endif int32_t cast_double_to_i32(double x) { return (int32_t)x; } int main(void) { printf("(int32_t)(-2.8) = %" PRId32 "\n", cast_double_to_i32(-2.8)); printf("(int32_t)1.99 = %" P
Timing for bringing page experience to Google Search
accessibility 10 advanced 195 AMP 13 Android 2 API 7 apps 7 autocomplete 2 beginner 173 CAPTCHA 1 Chrome 2 cms 1 crawling and indexing 158 encryption 3 events 51 feedback and communication 83 forums 5 general tips 90 geotargeting 1 Google Assistant 3 Google I/O 3 Google Images 3 Google News 2 hacked sites 12 hangout 2 hreflang 3 https 5 images 12 intermediate 205 interstitials 1 javascript 8 job s
JavaScript's Memory Management Explained | Felix Gerschau
javascriptJavaScript's Memory Management ExplainedEven though the JavaScript engine manages memory for us, it's good to know what happens under the hood. Read in Chinese or Korean Most of the time, you can probably get by fine not knowing anything about memory management as a JavaScript developer. Afterall, the JavaScript engine handles this for you. At one point or another, though, you'll encount
Webbundle によるサブリソース取得の最適化 | blog.jxck.io
Intro WebBundle を用いてサブリソースのみを Bundle する、 Subresource Bundle の策定と実装が進んでいる。 これを用いると、複数サブリソースの取得を一回の fetch で行うことができ、 RTT を減らしつつも個別に取得したかのようにキャッシュを制御できる。 現時点での仕様と実装を解説する。 Intent to Prototype: Subresource loading with Web Bundles Subresource Bundling WebBundle の初期の仕様は、 HTML を頂点としたページ全体をまとめる方向で始まった。 WebBundle によるコンテンツの結合と WebPackaging | blog.jxck.io これをサブリソース(JS, CSS, Img etc)に対して利用できるようにする仕様だ。 HTML 自体は
Profiling React.js Performance
April 8, 2020 Today, we'll look at measuring React component render performance with the React Profiler API, measuring interactions with React's new experimental Interaction Tracing API and measuring custom metrics using the User Timing API. For demonstration purposes, we'll be using a Movie queueing app. The React Profiler API The React Profiler API measures renders and the cost of rendering to h
Use React.memo() wisely
Users enjoy fast and responsive user interfaces (UI). A UI response delay of fewer than 100 milliseconds feels instant to the user. But a delay between 100 and 300 milliseconds is already perceptible. To improve user interface performance, React offers a higher-order component React.memo(). When React.memo() wraps a component, React memoizes the rendered output of the wrapped component and then sk
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Benchmarking JavaScript Memory Usage
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