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Zoompf's Web Performance Blog

Visualizing image optimizations with hex editors and strings

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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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SSL Performance Diary #1: The Certificate Chain

Adding support for encrypted SSL connections to a website doesn’t have to reduce the performance of your site. SSL can be properly configured so that it provides security and confidentiality, with minimal impact on the website’s page load time. In fact, SSL is a necessary step to implementing SPDY, which can actually improve the performance [...]

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5 New WPO Features

Today I am happy to announce that we have launched a new version of Zoompf WPO! We’ve added some great new features and other improvements based largely on feedback we received from our users. Here is what is new: Optimized Image Comparison As I’ve written about many times before, images are a huge part of [...]

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Apple’s Nitro JavaScript Engine Available To All Apps

Last weeks announcement that Safari would support SPDY wasn’t the only interesting piece of web performance news to come out of Apple’s WWDC 2014 event. Apple also announced that, with iOS 8, apps using the embedded web browser control, WKWebView, will gain full access to the powerful Nitro JavaScript engine. And this is a big [...]

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SPDY coming to Safari, future versions of IE

SPDY, the next generation web transport protocol, continues to gain ground and acceptance. I’ve been watching SPDY very closely and writing extensively about it for the last few years. Last year I broke the news that Facebook had adopted SPDY, ahead of other tech news sites like Wired. Zoompf has also built SPDYCheck.org, to help [...]

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Google Adds Ability for Better Performance Metrics

Last week, Google published a post entitled Understanding web pages better on Webmaster Central blog. The post discussed how the web has evolved from static HTML pages to richer content with lots of JavaScript and CSS and what this evolution means for Google’s web crawlers. But, as we will present here, Google’s post also has [...]

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