Initcwnd settings of major CDN providers

August 27, 2014

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 August 2014 show and learn how we tested.

How to protect your CDN origin server

March 18, 2013

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.

Real-world CDN performance for Google DNS and OpenDNS users

October 18, 2012

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.

Which CDNs support edns-client-subnet?

October 17, 2012

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?

Google DNS, OpenDNS and CDN performance

October 16, 2012

In the first of a series of 3 blog posts, find out how popular the Google Public DNS and OpenDNS services are in countries across the globe based on millions of real-user tests.

A better CDN Finder

May 29, 2012

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.

How to test your CDN before go live

May 1, 2012

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: multi-CDN made easy

April 25, 2012

Turbobytes is a new and innovative multi-provider CDN platform that load balances amongst providers 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.

Announcing the Cloudfront Purge Tool

January 23, 2012

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.

How to do an effective trial with a CDN

January 11, 2012

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.

Tuning initcwnd for optimum performance

October 25, 2011

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.

Browser cachability issues with CloudFront

October 10, 2011

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.

Compare CDNs, side-by-side

October 10, 2011

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.

Many Akamai customers suffer outage

October 4, 2011

Since about 2:35pm EDT today, we noticed many sites that use Amakai go down. Akamai denies any outage at their end.

How to Select a CDN

October 3, 2011

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, nginx and gzip: not that simple

October 3, 2011

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.