vanilla-lazyload

LazyLoad is a lightweight (2.4 kB) and flexible script that speeds up your web application by deferring the loading of your below-the-fold images, videos and iframes to when they will enter the viewport. It's written in plain "vanilla" JavaScript, it leve

v19.1.3 URL: https://unpkg.com/vanilla-lazyload@19.1.3/dist/lazyload.min.js

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lazyload vanilla responsive images picture srcset sizes native SEO intersectionObserver progressive performance perfmatters async no-jquery

@sitespeed.io/throttle

Throttle your connection

v5.0.1 URL: https://unpkg.com/@sitespeed.io/throttle@5.0.1/lib/index.js

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latency throttle bandwith webperf perfmatters

sitespeed.io

sitespeed.io is an open-source tool for comprehensive web performance analysis, enabling you to test, monitor, and optimize your website’s speed using real browsers in various environments.

v37.3.2 URL: https://unpkg.com/sitespeed.io@37.3.2/lib/sitespeed.js

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performance web rules har webperf perfmatters navigation-timing browser

pagexray

Xray your HAR file and know all about the page

v4.4.4 URL: https://unpkg.com/pagexray@4.4.4/lib/index.js

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performance web har webperf perfmatters

coach-core

Core package for the Coach.

v8.1.1 URL: https://unpkg.com/coach-core@8.1.1/lib/index.js

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performance web advice webperf perfmatters coach