Conversion Rate Optimization: Are You Considering Page Speed as a Variable?


Every year my marketing team has an offsite planning meeting where we lay out major goals and initiatives for the coming year. Last winter, site speed made it to the top of that list. The main push for making site speed a priority came from our SEO team. They felt strongly that improving our website’s page load times would improve our organic rankings. Besides the potential SEO benefit, it just makes sense to give your visitors the best possible experience.

We are halfway through the year, and we’ve made some measurable improvements in site speed. Our IT department has revamped code, optimized images, etc. to give our webpages a diet, and we’ve seen real improvements in site speed. During this process, something interesting happened that we hadn’t really planned for or expected (although looking back we really should have).

Decreasing Page Load Time Can Drastically Increase Conversions

Right about the time we started making some major improvements in speed, we got a huge boost in our overall website conversion rates. We have tracked our overall website’s conversion rate for years, so when we experienced a 15%+ boost in overall conversion rates we were happily surprised.

Normally, when we get a huge lift in conversion rates we get a member of the team claiming credit. Not this time. We ended up concluding that market conditions and an overall shift in our search traffic from SEO to paid search was the primary driver for our big improvement in conversion rate. (I wish we were better about using something like Google Analytics Annotations to keep track of changes to the site).

After a closer analysis, it appears that site speed was definitely a huge contributor to our conversion rate improvements. Milliseconds matter. We found that our organic pages got the bulk of the benefit. Of course, this makes total sense. We’ve been testing PPC landing pages for years (without really considering site speed), and the winning pages just kept getting thinner and faster. Most of our landing pages have limited and simple navigation, no side bar, less content, etc.

Page Load Speed Is a Variable that Matters When Testing

Now I’m questioning all of those tests in which we didn’t consider page load times when picking winners. When we first started landing page testing, back when Offermatica first came on the scene, the main website was the champion and it lost every time to our smaller faster landing pages (where were you on that one Offermatica?). Maybe it was the design, our benefits message, unique value propositions, trust factors, calls to action, etc., but site speed had to be a major contributor and should have been considered.

If we can make this mistake, I’m guessing there are other folks out there doing the same thing. Next time you do a test on your website; make sure you can measure the page load time. If you need help making your website faster you might want to take a look at Google’s new page speed service.

I’m assuming there’s a point of diminishing returns when it comes to conversion rate benefit and site speed, but I don’t think we’ve hit it quite yet, so we will continue to make all of our web pages faster. Moving forward, page load time will be tracked on every recipe in every website test. The difference between 1.5 seconds and 2 seconds could trump your awesome new headline, image, or call to action.

While we're on the subject, check out KISSmetrics' infographic on loading time (click to enlarge).

Page Load Time

About the Author

Chad SummerhillChad Summerhill is the Manager of Digital Marketing at U-Pack Moving, as well as the author of the blog PPC Prospector, provider of free PPC AdWords tools for Excel, and co-founder at both queryminer (search query mining software) and gazel (Excel Add-in for AdWords). Follow him on Twitter!




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Mia Foster
Aug 23, 2011

Conversion rate is what I monitor most closely outside of traffic. It is essential for my sites to 'rinse the towel' in terms of our site visitors. Well written!

Nick Stamoulis
Aug 25, 2011

Page load time was always important from a usability perspective and for that reason Google has announced that it's a ranking factor to. Google wants to provide its users with the best possible search results. It doesn't want to send them to a page that takes 20 seconds to load. There are numerous tools out there that can tell you what your load time is and potential pages that are slowing it down.

Martin Smith
Jan 30, 2012

Very interest points. I am sure that there are many like myself that have never taken page load time into consideration. This is especially important with Word Press site with to many plugins which slow load time dramatically. I look forward to more of your insightful posts.

Jul 28, 2013

We have a page load time of about 2.5sec.for our site, but yes it can be improved and mobile experience can be further enhanced, we are working on it.Thanks for the kiss matrics chart.

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