Web Performance Tech Tips

Time to Interact: A New Metric for Measuring User Experience

A new performance metric has come on the scene that is less about measuring the actual time it takes for an entire page to load and more about measuring how long it takes for the page to deliver the experience the website visitor is seeking. Time to Interact (TTI) pinpoints the most critical moment in a page load—the moment the page’s primary interactive content is displayed and becomes interactive –from the end user’s perspective. Proponents say this is the new metric to watch because users do not need to wait until the entire page loads to begin to interact with the site. Ideally their experience with a website using TTI as an indicator would be better than using TTL (Time to Load).

New Image Formats Aim to Combat Website Bloat

Not much progress in supporting image formats has been made since the standard JPEG, GIF and PNG formats were brought to market more than 15 years ago. The reason is simple: Supporting new image formats across different browser types is hard. However, two new image formats have come on the scene in the last few years and have recently started to gain traction as a way to optimize images: WebP (put forth by Google) and JPEG XR (backed by Microsoft).