Focusing on the median or average is the equivalent of walking around with a pair of blinders on. We’re limiting our perspective and, in the process, missing out on so much crucial detail. By definition, when we make improving the median or average our goal, we are focusing on optimizing for only about half of our sessions.
Tim does the numbers…
By honing in on the 90th—or 95th or similar—we ensure those weaknesses don’t get ignored. Our goal is to optimize the performance of our site for the majority of our users—not just a small subset of them.
What Trys describes here mirrors my experience too—it really is worth occasionally taking a little time to catch the low-hanging fruit of your site’s web performance (and accessibility):
I’ve shaved nearly half a megabyte off the page size and improved the accessibility along the way. Not bad for an evening of tinkering.
A no-nonsense checklist of good performance advice from Karolina.
The paradox of performance:
This era of incredibly fast hardware is also the era of programs that take tens of seconds to start from an SSD or NVMe disk; of bloated web applications that take many seconds to show a simple list, even on a broadband connection; of programs that process data at a thousandth of the speed we should expect. Software is laggy and sluggish — and the situation shows little signs of improvement. Why is that?
Because we prioritise the developer experience over the user experience, that’s why:
Although our job is ostensibly to create programs that let users do stuff with their computers, we place a greater emphasis on the development process and dev-oriented concerns than on the final user product.
We would do well to heed Craig’s observations on Fast Software, the Best Software.
I hadn’t come across this before—run Lighthouse tests on your pages from six different locations around the world at once.
This could give a big boost to web performance!
A small-scale conspiracy theory from the innards of Google.
With this bookmarklet you’re only ever one click away from the Lighthouse results for a page.
Where should you be focusing your efforts when it comes to improving your site’s performance? Here’s a reusable framework for figuring it out.