A Book Apart

Mat Marquis Image Performance

Solve the most critical performance problems with the biggest impact: start with images.

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Read a Sample Chapter

To solve the most critical performance problems with the biggest impact, start with images. Responsive Issues Community Group (RICG) chair Mat Marquis helps us make smart decisions about images and shows us the swiftest way to improve a website’s performance: from understanding compression methods used by common image formats, to responsive image markup patterns and their usage, to handling content delivery for the best user experience. Get up to speed—and speed up your site.

What Are Briefs?

Briefs are ebook-only guides to essential fundamentals, of-the-moment techniques, or deep nerdery on a single aspect of a topic. Whatever the book, you’re only a quick break away from learning vital, practical know-how.


  1. Image Formats and Compression
  2. Responsive Images

Recommended with…

Animation at Work

Integrate animation into design systems to build better experiences and make smart decisions about images to speed up your site.

Buy both and save up to 10%

  • ebooks


    Supports Kindle, iBooks, Nook and most other readers and devices.


What People Are Saying

  • Mat explains technical concepts in a very human-friendly way, with an emphasis on users and user experience. While this book is brief, Mat guides you through everything you need to know to feel confident working with responsive images. You’ll hone your skills and create a more inclusive, performant web.

  • Image Performance is an entertaining, practical introduction to the finer details of image compression and performance online. The topic isn’t simple, but after reading this book, you could be forgiven for thinking it is—Mat’s just that good at explaining it.

  • When working with images on a website, your job is akin to that of a sommelier’s. Crafting the final product, like pairing wine with food, requires both technical skill and artistic subjectivity. Get it right and the website looks and works great; get it wrong, and the whole experience suffers. Mat will help you get it right.

About the Author

Mat “Wilto” Marquis is an amateur boxer, aspiring chef, halfway decent carpenter, and passable antique British motorcycle mechanic—when not making fast, accessible, responsive websites. He keeps busy.

As chair of the Responsive Issues Community Group, Mat spearheaded the effort to bring native responsive image solutions to the HTML5 specification, later going on to facilitate browser implementations and oversee the addition of native responsive image techniques to major CMSes. He has spoken at An Event Apart, edited for A List Apart, and published books with A Book Apart, completing what he describes as “like an EGOT, but for putting semicolons in the right places.”

Additional Info

  • ISBN: 978-1-937557-77-5
  • PDF: 67 pages
  • Published: Sept 18, 2018

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