Simon Hearne

CSS image sprites can provide a performance benefit for most sites.

1) Performance KPIs are brokenPermalink to this heading# This was one of the themes that ran like an undercurrent through the whole conference, starting with Steve Souders at WebPerfDays talking about the death of window.onload for performance measurement.

(p.s., the video of my talk on performance for low powered devices is up!)

Note: this issue has since been resolved by the Chrome team, please proceed with caution!

Do you know when your website's speed starts to impact your customers' behaviour?

Visual metrics such as Speed Index, render start and visual complete are the best proxies we have for user experience.

Bruce Lawson - web.nextPermalink to this heading# Description | Slides | VideoPermalink to this heading# I had assumed that Bruce's talk would be identical to the last few I've seen.

One of my favourite tasks as a consultant is to provide reports to clients which make recommendations for improving site speed.

Another post lists the talks that didn't quite get five stars from me!

Another post lists the talks that got five stars from me!

Here's the bookmarklet: Jank Meter Drag it to your bookmarks bar or just add as a bookmark.

According to Modernizr.com, Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user's browser.

Web performance is critical to a successful online business.

Andy Davies and I have spoken at a number of conferences about the risks that third-party components can have on your website.

We've discussed how to find the third-party assets on your site and started to look at how to mitigate the risk that they pose.

Go to the tool I've recently had a few clients ask if there is a way to test when certain parts of their pages become visually complete.

Go to the tool My customers often ask how a third-party asset got on their site.

Our web performance industry was unquestionably seeded by Steve Souders' book High Performance Websites.