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Zoompf's Web Performance Blog

SSL/TLS Performance Diary #3: Optimizing Data Encryption

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This post is one in a series of posts about properly implementing SSL/TLS. This post is excerpt from our recent Moz article, Enabling HTTPS Without Sacrificing Your Web Performance. We’ll cover additional topics from this article in future posts to our SSL Diary. In previous SSL/TLS diary posts, we discussed optimizing the certificate chain, as […]

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This Lossless PNG Optimization You’re Probably Not Using Shrunk One File an Extra 39%

From flickr, shared under Creative Commons 2.0 At Zoompf we routinely get asked questions about the best way to optimize images for performance. The other day, however, we received one question that left us scratching our heads. After some detective work, we uncovered a little known, yet extremely effective tactic for lossless PNG reduction that […]

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Connect-JS Talk: Optimizing Front-end Web performance like a rockstar

I recently spoke at Connect-JS, an awesome JavaScript conference held in Atlanta. They had an incredible line up of speakers and I was honored to be apart of their inaugural year. There was a large turn out, and while less intimate than smaller conferences I've spoken at like JSConf, Connect-JS was a lot of fun […]

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Content Detection: A wretched hive of scum and villainy

A few days ago, I wrote about how the BBC was serving a BMP image as a JPEG. Several people have asked me why would this even work at all? The file extension and the MIME Type both implied it was a JPEG, but the file wasn’t a JPEG. How could the browser even render […]

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From Performance Issue to Bug to 3 New Features

“It has to be a bug” I thought. “This makes absolutely no sense!” We were about to go live with a major new product, and I had just found what looked like a show-stopping bug. But it wasn’t a bug. In fact, it was something so odd and cool, I ended up creating 3 new […]

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Debug Your Performance Defects with Zoompf Alerts

In this post I wanted to highlight some of the great free tools now available to our Zoompf Alerts beta users for debugging and fixing performance defects. (And if you’re not on the beta, it’s still not too late to sign up!) Understanding the Problem The first step to fixing a problem is of course […]

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Visualizing image optimizations with hex editors and strings

I’m a big fan of image optimizations, and have written several posts about it. Images dominate the web in terms of both byte size and request count. Luckily, they are super easy to optimize with free and/or open source tools. For lossless image optimization, you can expect to consistently reduce the size of your image […]

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Tips to Reduce Your Performance Alert Email Frequency

As your website evolves, it’s inevitable your focus on site performance optimization will ebb and flow. During a new project you may be highly focused on the performance of a new feature, but then after the code deploys and the PR goes out, you settle into maintenance mode, monitoring for regressions until the next big […]

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A New Way to Justify Your Ongoing Performance Improvement Efforts

There are many great tools out there to measure your current website performance, among them WebPageTest, Google Pagespeed, and of course the Zoompf Free Report. These are fantastic tools for capturing the current state of your website, but all lack one common shortcoming: they provide no historical context of how much better (or worse) your […]

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SPDYCheck’s New Features: HSTS and Custom Ports

I’m happy to announce a new version of SPDYCheck with a number of improvements. SPDYCheck is an online tool that verifies the many different things a website must do to support SPDY. SPDYCheck also tests a test for best practices which ensures SPDY is used whenever possible. In the last 2 years since SPDYCheck was […]

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