CDN Blog

How fast you can purge a cached object on Amazon CloudFront, CacheFly and other CDNs? Our CDN Purge Speed Stats has the answer based on hourly, global measurements.

In-depth review of Cloudflare Browser Insights, a site speed analytics service for Core Web Vitals and more.

New capabilities, changes to limits and analytics improvements: ten things we want from Cloudflare to make Workers and Workers KV even better.

Reliable, fast and accurate. The popular CDN Finder tool has been completely rebuilt in 2020 and now delivers excellent results.

Check your CDN's performance from 10 residential locations around the world, including Brazil, France and India.

In this first article in our series about CDN debugging, we share three tips for collecting useful data. Good data is essential when trying to find the problem with your CDN's content delivery.

Learn what happened in the CDN market in June 2017.

A new product offering, network expansion and a big funding round. Learn what happened in the CDN market in May 2017.

New product offerings, network expansions and an acquisition. Learn what happened in the CDN market in April 2017.

What can you do to optimize CDN performance? Learn about ten ways to effectively enhance content delivery speed and reliability.

Improve the speed and performance of Google Fonts. Learn what the preconnect hint is and how it works.

Dummy Origin makes it easier to evaluate the (caching) behavior of a CDN. Open source, easy to install and a joy to use.

CDN Planet introduces CDN Guides: informational articles about Content Delivery Network features like compression, purge and serve stale.

When using your root/apex domain on a CDN, don't simply expect excellent performance.

How can you protect your CDN origin servers from malicious attacks, incl. DDoS attacks? We describe a few options, with one being the clear winner.

Number 3 in a series of 3 blog posts gives insight in the relative performance the CDNs deliver to Google DNS and OpenDNS users in different countries.

Number 2 in a series of 3 blog posts: what is edns-client-subnet, how is it relevant to CDN performance and which CDNs currently support it?

Our easy to use and popular CDN Finder tool has been rebuilt from the ground up, resulting in much better results. Read about the changes we made, how it is built and how the user benefits.

When turning on a CDN for your site, make sure to test your config/setup actually works. If you don't, you can be in big trouble. We show you 4 ways to do this testing and number 1 is clearly not our favourite...

Turbobytes is a new and innovative multi-provider CDN platform that load balances amongst CDNs based on performance, enabling publishers, webshops and others to get optimal performance worldwide. Great pricing, a friendly Cancel-Anytime policy and no need for your own contracts with several CDNs.

Find out how popular the Google Public DNS and OpenDNS services are in countries across the globe based on millions of real-user tests.

Currently, you cannot purge files from CloudFront via the AWS console, which means you always have to do it via the API. The CloudFront Purge Tool, a Chrome extension, takes away the hassle of using the AWS API, and enables you to quickly purge one or more files. Yes, it is secure.

You are in the process of selecting a Content Delivery Network and have a shortlist of candidates. Next step: do a trial with them. How can you best do a trial with a CDN? Read our tips.

Initcwnd is one thing to tweak on the server to improve TCP performance. What is the initcwnd value of CDN providers? Find out what our tests in Feb 2017 show and learn how we tested.

Tuning the initial congestion window parameter (initcwnd) on the server can have a significant improvement in TCP performance, resulting in faster downloads and faster webpages. Get an in-depth understanding of TCP slow start and how to tune for performance.

In this post, I intend to illustrate some potential issues with browser cachability when using Amazon CloudFront and some possible work-arounds. These are some issues all CloudFront users should be made aware of. Sending stale responses to users may have a big impact on user experience.

By popular demand, we now provide an easy way to compare two CDNs, side-by-side on a single page. No bells, no whistles, just all the useful info about the CDNs.

Your goal is to select the Content Delivery Network that is a perfect fit with your needs and requirements. Learn about the 4 categories of selection criteria (functionality, performance, costs and service) and read our tips on how to effectively and efficiently go through the selection process.

CloudFront's request to origin servers are marked as HTTP/1.0. By default nginx does not send gzipped response to a HTTP/1.0 request. gzip_http_version setting should be set to 1.0 for it to work correctly.