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

Measuring the webpage AFT(Above the Fold Time) performance

Aritcle on how to use to get the AFT(above the fold time)

Steve Souders – Performance Tools list

Steve blog on list of of performance tools

Performance Acceleration Step-wise

Nice article on how to improve performance of a page in a step-wise manner.

This also shows , how to benchmark page and identify the base metrics to compare with the improvements

Evaluating HAR Storage for comparing two HARs – In Draft