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Performance

November 28

Testing new ideas with Fastly Fiddle

Quickly experiment, debug and try out ideas on Fastly's platform, without signing up, or even logging in.

June 21

Introducing Quick Value Packages

Keeping your digital presence continuously tuned, optimized, and secure to align with changing business and technical requirements can be time consuming. That’s why we’ve put together our…

June 13

Towards ever faster websites with early hints and priority hints

Websites still load too slowly. During the most critical time in the page load lifecycle, your connection is often almost totally idle. At Fastly, we’re watching a new technology that…

May 2

Clearing cache in the browser

Caching assets in the browser is the most common and most obvious way to improve front end performance. But at some point every developer accidentally makes a bad release of an asset with a…

March 27

ButterCMS on building a globally performant + reliable API

Without realizing it, many of us are building single points of failure into our stack. Fastly customer ButterCMS requires near-100% uptime for their customers, but after multiple outages…

January 17

Understanding the Vary header in the browser

Browsers need to understand and respond to Vary rules, and the way they do this is different from the way Vary is treated by CDNs. In this post, Principal Developer Advocate Andrew Betts…

November 1

Diff at the edge with serverless cloud functions

Requesting the difference between two previously cached files — using just a CDN configuration and a serverless cloud compute function — is a great example of exploiting edge and serverless…

October 19

The QA mindset: designing for reliability

Fastly’s engineering teams are smart and capable — they architect thoughtfully, write elegant code, and work carefully with incredible complexity and scale. So why would they (or anyone…

September 26

Getting more out of IO with image transformation classes

We’ve worked to ensure the Fastly Image Optimizer is simple, easy to use, and most importantly fully integrated into the platform. In an effort to give you even more control, we've developed…

September 12

Server-sent events with Fastly

Server-sent events allow web servers to push real-time event notifications to the browser on a long-lived HTTP response. It's a beautiful part of the web platform that’s severely underused…

August 22

Getting the most out of Vary with Fastly

You can use the Vary response header in creative ways, including A/B testing and internationalization. At the same time, many people still use Vary badly or misunderstand what it does; in…

August 2

Introducing batch API for surrogate key purge

Surrogate keys give Fastly customers a unique way to efficiently purge content from cache — batch API for surrogate key purge allows you to purge content even more efficiently by purging…