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Performance

March 18

The cache hit ratio (or hit ratio for short) is the ratio of hits to cacheable requests (hits and misses combined). There's also cache coverage, the ratio of cacheable requests to all…

January 27

If you want to increase the efficiency of your Varnish (or Fastly) cache, you need to figure out what traffic is not cached. By definition, any traffic that reaches your origin is not cached…

January 9

In the second part of our series on accelerating Rails, I'll cover configuration of a few Fastly features, Varnish and Varnish Configuration Language (VCL), and strategies for caching…

December 15

In the continued quest to increase cache hit ratios, the chant is: "Normalize, normalize, normalize." Less variation in your requests means you have a higher chance of getting hits. This…

November 19

Caching is one strategy that helps ease scaling pains that I often see Rails developers overlooking. Starting out with caching can be confusing, because terms and documentation can be…

November 17

In this post, I’m going to discuss how you can leverage ESI and VCL (Varnish Configuration Language, the domain-specific language that powers Fastly’s edge scripting capabilities) to use…

October 27

Today, we’re excited to announce two related features that lower bandwidth costs and reduce origin load for Fastly customers, resulting in faster downloads for their users: Streaming Miss…

October 22

Fastly recently conducted an extensive analysis of which resources should be compressed. Today, the results of that analysis are reflected in the Fastly app, which allows our customers to…

October 2

Hooman Beheshti, VP of Technology at Fastly, recently gave a talk at Velocity NYC 2014 about the challenges CDNs face with dynamic content and how businesses can use programmatic means to…

August 27

Fastly customers can use ESI to cache pages that contain both cacheable and uncacheable content (such as user-specific information).

August 18

Vary is one of the most powerful HTTP response headers. Used correctly, it can do wonderful things. Unfortunately, this header is frequently used incorrectly, which can lead to abysmal hit…