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Zoompf's Web Performance Blog

SSL Performance Diary #4: Optimizing the TLS Handshake

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In our prior SSL Performance Diary post, Optimizing Data Encryption, we mentioned there are 2 areas of TLS that can harbor performance problems: Encrypting the data. Data sent back and forth between visiting web browsers and your web server must be encrypted and decrypted. If not configured properly, your page load times can become much […]

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SSL/TLS Performance Diary #3: Optimizing Data Encryption

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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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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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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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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SSL Performance Diary #2: HTTP Strict Transport Security

This post part of a series, where I discuss the steps I am taking to implement SSL on a website while simultaneously improving its performance. I previously discussed optimized SSL certificates. Today I’ll discuss a super easy SSL performance optimization that everyone should be doing: HTTP Strict Transport Security. When we were designing the web […]

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Announcing the Zoompf Alerts Beta!

Today we are ecstatic to announce the public beta launch of Zoompf Alerts! Zoompf Alerts is a new website performance solution that continuously scans your web pages for changes that introduce new performance defects. Unlike traditional performance monitoring solutions, Zoompf Alerts does not focus on measuring page load times. Instead, Zoompf Alerts detects when actual […]

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How Fast Is… FIFA’s World Cup Website?

Our regular video series How Fast Is…? examines real world websites and details the cause of their performances issues as well as what should be done to solve them. After all, the best way to learn about front-end web performance is to see what other people are doing right and doing wrong. In this edition […]

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