ENTRIES TAGGED "web performance"

Iterate on performance

Start with a baseline benchmark and measure continuously from there

The two most important tasks to ensure your site remains fast are benchmarking and iterating on your site’s page load time. Quick performance wins can be celebrated today, but the health of your site will thrive with routine check-ins and deliberately balancing performance and aesthetics.

Benchmarking Page Load Time

WebPagetest is many developers’ go-to tool for measuring performance. You can enter any live URL and choose a geographic location and which browser you want to test against. It’ll show you things like waterfalls, which diagram the images and other files that make up your total page load time and help you spot page load time issues.

Two additional tools that can analyze your site’s performance against a set of best practices and provides suggestions for improvement are YSlow and PageSpeed. As you get started with improving page load time, I recommend checking out all three of these tools to iron out performance basics on your site.

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HTML and CSS performance

Efficient, reusable markup reduces development work while boosting page load time

[Ed note: This is the third in a series of posts on web design and performance. You can see the first two posts here and here.]

Optimizing your markup can have a substantial impact on your site’s page load time. Bloated HTML leads to bloated CSS, and vice-versa. For example, during a semantics and reusability template cleanup, I was able to significantly reduce the file size of site-wide HTML, CSS, and stylesheet images.

site-cleanup

I achieved this by simply renaming existing elements to have more semantic meaning and then removed unnecessary elements in the HTML (also known as divitis) to focus on reusability. Later in the same cleanup effort, I was able to cut CSS by 39% by removing unused selectors, combining and condensing styles, and normalizing the colors used across the site.

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Image Performance

Optimizing images is likely the biggest win for performance on your site

[Ed note: This is the second in a series of posts on web design and performance. You can see the introductory post here.]

Images make up the majority of most sites’ page weight. Thanks to their size and the number of image requests made by an average site, optimizing images is arguably the easiest big win when it comes to improving your site’s page load time.

chart

Let’s start by looking at the various image types available, and then work through the various options you have for optimizing them.

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Web Performance Is User Experience

Efforts to optimize your site have an effect on the entire experience for your users

Think about how you search for things on the web. How quick are you to close a tab and go to the next search engine result if a site takes too long to load? Now consider doing that on your phone while waiting in line for your coffee order–you have even less time, so your expectations for a site to load quickly are even higher.

Web performance is user experience. Fast page load time builds trust in your site; it yields more returning visitors, more users choosing your site over a competitor’s site, and more people trusting your brand. Users expect pages to load in two seconds, and after three seconds, up to 40% of users will abandon your site. Similar results have been noted by major sites like Amazon, who found that 100 milliseconds of additional page load time decreased sales by one percent, and Google, who lost 20% of revenue and traffic due to half a second increase in page load time. Akamai has also reported that 75% of online shoppers who experience an issue such as freezing, crashing, taking too long to load, or having a convoluted checkout process will not buy from that site.

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Giving the Velocity website a performance makeover

Giving the Velocity website a performance makeover

Four simple optimization steps produce big results.

Learn how producers slimmed down the Velocity conference site, cutting the site's load time by 3.5 seconds and dropping 49% of the page weight.

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Velocity 2011

Velocity 2011

A tribe of web performance and operations pros is pushing the web forward.

As we approach the fourth Velocity conference, here's a look at how the web performance and operations communities came together, what they've done to improve the web experience, and the work that lies ahead.

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