Blog/webperf

Insights and advice for improving web performance.

A Slow Website - Time to First Byte (TTFB)

A Slow Website - Time to First Byte (TTFB)

There are many reasons why your website may be slow. Time to first byte (TTFB), respectively time to last byte (TTLB), for the initial HTML document is one explanation we want to focus on in this post. In most of the cases we talk about how to optimize our frontend such as minimizing CSS or compressing images. This is a very important aspect to have a fast loading website but there are good reasons to optimize the backend as well.

May 5, 2015 Read more
Parallel Downloads Across Domains

Parallel Downloads Across Domains

Parallel downloads are simply multiple downloads that take place concurrently across multiple domains hosted by one host. The main benefit of parallel downloads is reducing download time when downloading many resources. It is important to note that web browsers aren't designed to allow parallel downloads. Typically, web browsers limit the number of concurrent connections made to a host. Commonly they are limited to 6 concurrent transfers. This results in a backlog of resources when there are many assets waiting to be downloaded.

April 20, 2015 Read more

HTTP/2 - What Does It Mean for a CDN?

KeyCDN announced the support of SPDY in 2014 which was a great improvement in terms of speed but the update of Google to drop SPDY introduces the start of the next big protocol change. This post gives some insight of the transition from SPDY to its successor HTTP/2. The technology of SPDY is certainly not a dead end. It is the core of HTTP/2 and eliminates limitations in the SPDY draft.

April 8, 2015 Read more

KeyCDN Tools - Analyze Website Speed and Performance

KeyCDN Tools provide you a set of online checks to analyze your website or identify connectivity issues. The tools simplify the problem resolution process of your web projects. This article describes KeyCDN Tools in more detail and shows how you can benefit from them. Overview Here are some of the free web tools available that can be used: Website Speed Test: Full page speed check to test how fast your website is loading from different locations.

March 31, 2015 Read more

CDN Performance - Measure with WebPageTest

Customers sometimes ask us how to measure the performance improvement after migrating to KeyCDN. This post is about how to easily and conveniently measure the performance of a website. CDN performance measured by WebPageTest The best known website for website performance testing is WebPageTest. It offers performance tests from many locations worldwide with different browsers to choose. Once you have migrated to KeyCDN, WebPageTest will automatically recognize the CDN and display it accordingly.

June 19, 2014 Read more
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