国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Home Web Front-end JS Tutorial Text compression & Code splitting & Modern image formats - Performance optimization

Text compression & Code splitting & Modern image formats - Performance optimization

Dec 13, 2024 am 12:10 AM

Text compression & Code splitting & Modern image formats - Performance optimization

I tried the following to optimize my side project performance:

  1. text compression
  2. code splitting
  3. modern image formats.

Profiler

The app I built used Vite with pnpm. Modern web build tools automatically optimize web performance by default in the build process. So we can pnpm run build then pnpm dlx serve dist. Then use Lighthouse of Chrome DevTools as a guide to address each bottleneck it lists.

Enable text compression

It affects FCP and LCP.

The first thing that Lighthouse suggests is compressing text using algorithms like br or gzip.

The common practice is to add Accept-Encoding: gzip whenever making web requests. Since the app I am building serves the resource locally, I installed the vite-plugin-compress to compress the files.

Step 1: install vite-plugin-compress
Step 2: configure the vite.config.js file, and add the plugin and some parameters. As Google Developers suggests, it should use br(brotliCompress) over gzip as much as possible.

For example

viteCompression({
      verbose: true,
      disable: false,
      algorithm: 'brotliCompress',
      ext: '.br',
    }),

Step 3: run pnpm run build to compress

It successfully compressed .js and .css files.

Logs:

? [vite-plugin-compression]:algorithm=brotliCompress - compressed file successfully.

Vite would compress the file by default using .gzip, but brotliCompress can do better, compression during the build process:

Vite with gzip

vite v5.4.10 building for production...
? 654 modules transformed.

index-B9QUW17e.css 8.60 kB │ gzip: 2.33 kB
PauseMenu-DjZ95K-6.js 1.77 kB │ gzip: 0.62 kB
index-ohAKp9W9.js 1,688.05 kB │ gzip: 454.20 kB

Vite-plugin-compression with br

? [vite-plugin-compression]:algorithm=brotliCompress - compressed file successfully:
PauseMenu-DjZ95K-6.js.br 1.73kb / brotliCompress: 0.51kb
index-B9QUW17e.css.br 8.40kb / brotliCompress: 1.97kb
index-ohAKp9W9.js.br 1648.49kb / brotliCompress: 345.30kb


Reducing unused JavaScript

It affects FCP and LCP.

Use the Coverage Tab in Google DevTools to see the scripts that have unused bytes over 20kbs.

Since I am using Vite with React, code splitting is the first thing about reducing unused JavaScript.

In React, and lazy() can help with that.

  1. Use to wrap the whole App and provide a fallback UI, like
    Loading
    , this provides a fallback UI when the app is loading.
  2. Use lazy() to wrap the components which not used on the initial page. For example, for games, when users press down the Esc key, a menu that you can wrap up pops up.

Serve images with modern formats

Chrome Developers suggests serving images in AVIF or WebP format. I chose WebP because it has more support across browsers.

The latest versions of Chrome, Firefox, Safari, Edge, and Opera support WebP, while AVIF support is more limited.

You can check WebP image format support info at Can I use.

You can install the cwebp library at WebP and use the command cwebp -q 50 images/flower1.jpg -o images/flower1.webp to convert .png to .webp.

This command converts, at a quality of 50 (0 is the worst; 100 is the best), the images/flower1.jpg file and saves it as images/flower1.webp.

The compression result is quite impressive. One of the files is reduced in size from 3.5 MB to 178kb. Even the low information intensity ones give 4x compression.

We can even write a simple .bat script to automatically convert all the .png images under the target folder into .webp images.

viteCompression({
      verbose: true,
      disable: false,
      algorithm: 'brotliCompress',
      ext: '.br',
    }),

Reference

  • Remove unused JavaScript
  • View used and unused CSS with the Coverage tab.
  • Serve images in modern formats.
  • Creating WebP Images with the Command Line
  • Precompiled Utilities
  • WebP image format - Can I Use
  • Largest Contentful Paint (LCP)
  • First Contentful Paint (FCP)

The above is the detailed content of Text compression & Code splitting & Modern image formats - Performance optimization. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Which Comment Symbols to Use in JavaScript: A Clear Explanation Which Comment Symbols to Use in JavaScript: A Clear Explanation Jun 12, 2025 am 10:27 AM

In JavaScript, choosing a single-line comment (//) or a multi-line comment (//) depends on the purpose and project requirements of the comment: 1. Use single-line comments for quick and inline interpretation; 2. Use multi-line comments for detailed documentation; 3. Maintain the consistency of the comment style; 4. Avoid over-annotation; 5. Ensure that the comments are updated synchronously with the code. Choosing the right annotation style can help improve the readability and maintainability of your code.

The Ultimate Guide to JavaScript Comments: Enhance Code Clarity The Ultimate Guide to JavaScript Comments: Enhance Code Clarity Jun 11, 2025 am 12:04 AM

Yes,JavaScriptcommentsarenecessaryandshouldbeusedeffectively.1)Theyguidedevelopersthroughcodelogicandintent,2)arevitalincomplexprojects,and3)shouldenhanceclaritywithoutclutteringthecode.

Java vs. JavaScript: Clearing Up the Confusion Java vs. JavaScript: Clearing Up the Confusion Jun 20, 2025 am 12:27 AM

Java and JavaScript are different programming languages, each suitable for different application scenarios. Java is used for large enterprise and mobile application development, while JavaScript is mainly used for web page development.

Javascript Comments: short explanation Javascript Comments: short explanation Jun 19, 2025 am 12:40 AM

JavaScriptcommentsareessentialformaintaining,reading,andguidingcodeexecution.1)Single-linecommentsareusedforquickexplanations.2)Multi-linecommentsexplaincomplexlogicorprovidedetaileddocumentation.3)Inlinecommentsclarifyspecificpartsofcode.Bestpractic

Mastering JavaScript Comments: A Comprehensive Guide Mastering JavaScript Comments: A Comprehensive Guide Jun 14, 2025 am 12:11 AM

CommentsarecrucialinJavaScriptformaintainingclarityandfosteringcollaboration.1)Theyhelpindebugging,onboarding,andunderstandingcodeevolution.2)Usesingle-linecommentsforquickexplanationsandmulti-linecommentsfordetaileddescriptions.3)Bestpracticesinclud

JavaScript Data Types: A Deep Dive JavaScript Data Types: A Deep Dive Jun 13, 2025 am 12:10 AM

JavaScripthasseveralprimitivedatatypes:Number,String,Boolean,Undefined,Null,Symbol,andBigInt,andnon-primitivetypeslikeObjectandArray.Understandingtheseiscrucialforwritingefficient,bug-freecode:1)Numberusesa64-bitformat,leadingtofloating-pointissuesli

JavaScript vs. Java: A Comprehensive Comparison for Developers JavaScript vs. Java: A Comprehensive Comparison for Developers Jun 20, 2025 am 12:21 AM

JavaScriptispreferredforwebdevelopment,whileJavaisbetterforlarge-scalebackendsystemsandAndroidapps.1)JavaScriptexcelsincreatinginteractivewebexperienceswithitsdynamicnatureandDOMmanipulation.2)Javaoffersstrongtypingandobject-orientedfeatures,idealfor

How to work with dates and times in js? How to work with dates and times in js? Jul 01, 2025 am 01:27 AM

The following points should be noted when processing dates and time in JavaScript: 1. There are many ways to create Date objects. It is recommended to use ISO format strings to ensure compatibility; 2. Get and set time information can be obtained and set methods, and note that the month starts from 0; 3. Manually formatting dates requires strings, and third-party libraries can also be used; 4. It is recommended to use libraries that support time zones, such as Luxon. Mastering these key points can effectively avoid common mistakes.

See all articles