Google LightHouse

Lighthouse tests if your app:

  • Can load in offline or flaky network conditions
  • Is relatively fast
  • Is served from a secure origin
  • Uses certain accessibility best practices

Lighthouse can be run as a chrome plugin or as command line nodejs tool



Many of the components from 3rd party affect the page load performance.

A nice slideshare article on 3rd Party SPOF(Single Point of failure) and how to mitigate the same by using the following options

  1. Defer
  2. LazyLoad
  3. Async

Ref :

Adding iOS agents to Webpagetest

Spdy protocol from google for faster web

SPDY is an experiment with protocols for the web.  Its goal is to reduce the latency of web pages.

More detail in the following video

Image compression with webp

WebP is a new image format that provides lossless and lossy compression for images on the web. WebP lossless images are 26% smaller in size compared to PNGs. WebP lossy images are 25-34% smaller in size compared to JPEG images at equivalent SSIM index. WebP supports lossless transparency (also known as alpha channel) with just 22% additional bytes. Transparency is also supported with lossy compression and typically provides 3x smaller file sizes compared to PNG when lossy compression is acceptable for the red/green/blue color channels.

Webp format has been implemented in Opera . Check the following value for “Accept” header. This includes “image/webp”

Opera text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/webp, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1

More details in :

Compress data more densely with Zopfli

The Zopfli Compression Algorithm is a new open sourced general purpose data compression library

Zopfli in action :

Steve Souders Blog on Zopflinator :

WPT beyond basics