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Zoompf's Web Performance Blog

How to Automatically Bundle Your CSS and Javascript in ASP.Net

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Last year I wrote a beginner’s guide to using mod_pagespeed in Apache that allows the Apache developer to recognize significant performance optimizations for their site with very little effort. I thought it might be fun to revisit this topic, but this time focus on a great library for ASP.Net developers: System.Web.Optimization. In this post I […]

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HTTP/2: A Fast, Secure Bedrock for the Future of SEO

In prior articles we've written extensively about website performance and securing your website, both factors Google has publicly announced as search ranking factors. These articles provide extensive tips using existing tools and technologies to improve your site performance and security (tips we highly recommend you follow). But did you know Google also developed and is […]

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SSL Performance Diary #4: Optimizing the TLS Handshake

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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How to Quickly Spot and Fix Those “Link Not Found” Errors

If you’re using our free Zoompf Alerts product, you may have noticed there is a test for “Link Not Found” errors found on your page (also known as “404 Errors” or “Page Not Found”). As the name suggests, a Link Not Found error is returned from the webserver when the requested page does not actually […]

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A New Way to Audit Your Responsive Mobile Site Performance

While responsive website design can be a great way to simplify your website code across multiple form factors, it does come at the cost of extra complexity in your CSS and Javascript. As the browser type and viewport sizes change, different CSS rules are applied, different javascript lines may be executed, and even different images […]

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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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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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