Smashing Conference

Guy Podjarny


Guy Podjarny, or Guypo for short, is a Web performance researcher and evangelist, constantly chasing the elusive instant Web. Guy is the Chief Technology Officer (CTO) of Akamai’s Web Experience business unit, dealing with everything fast browsing and mobile. Guy was previously the co-founder and CTO of, acquired by Akamai in 2012.

Guy focuses heavily on Mobile Web Performance and Front-End Optimization, is a fan of large scale tests using real world websites, and regularly digs into the guts of mobile browsers. Guy is also the author of Mobitest, a free mobile measurement tool, and contributes to various open source tools.

Before digging into performance, Guy spent a decade working on Web Application Security, and more specifically the first Web App Firewall (AppShield) and the market leading Web Application Security scanner (AppScan).

Putting Your Images on a Diet

Tuesday, 18th – 14:40

Images are quickly becoming one of the most critical factors for web performance. On one hand, users are demanding more visual websites, driving an increase in the number of images on a page and making background images cool again. On the other hand, technology trends such as Retina displays and RWD are making it much harder to choose the right image to download at any given time, avoiding the download of excess bytes.

In this talk, we'll talk about what you can do to maximize the impact of every image byte. We'll explain the concept of Image Compression, understand how it applies to different image formats, and show the tools and techniques you should use to communicate the best visuals with the fewest bytes. Lastly, we'll show how to combine image compression and Retina displays, and discuss some newer image formats and how you can take advantage of them today.

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