Content Delivery Networks (CDNs) and Optimizely
Content Delivery Networks (CDNs) and Optimizely

Optimizely makes use of a Content Delivery Network, a global network of web servers to render the snippet. This page will serve as a hub for Knowledge Base articles about CDNs and related topics like self-hosting the Snippet.

Optimizely snippet self-hosting

Optimizely works best when you place our code snippet into the head tag of your websites. This synchronizes the Optimizely software with the tests that you are running.

Self-hosting has many benefits

The Optimizely snippet that you self-host can offer a variety of security and performance advantages. You can use multiplexing to speed up the request if you are using HTTP/2 and a CDN to serve your website.

During the initial loading of a page, an additional DNS lookup, new HTTP connection and a SSL handshake are usually required.

Traditional self-hosting may be more suitable for you if you have internal security policies that make it difficult to load third-party Javascript tags.

Self-hosting using CDNs

You may be able use your CDN to deliver Optimizely snippets to websites if you are using it to serve them.

There are slight differences in configurations depending on whether you use a standard or customized snippet. Make sure to check your project before you start.

  • Optimizely self hosting for Akamai users
  • Optimizely self hosting for Amazon Cloudfront users
  • Optimizely self hosting for Cloudflare users
  • Optimizely self hosting for Fastly users

How CDN Optimizely can help you improve your business?

Optimizely can be used to speed up your site’s loading speeds. According to web development best practices, any third-party JavaScript files, such as Optimizely’s, should be placed at the bottom of the page. They should then be loaded asynchronously. This is to ensure that these resources load quickly but do not impact the user’s visual experience.

Optimizely, however, alters the page’s visual experience as it loads. This means that the changes are made before any visitors see any content. Customers can implement Optimizely snippets synchronously in their head tags. This allows the snippet to execute its changes before any content loads. Customers experience a slight increase in page loading speed. Optimizely has two main ways to increase load speed.

CDN Optimization and How Latency Affects the Load Speed

Latency refers to a delayed rendering or loading of a webpage. It is when a website page does not make a lot of effort in order to display pictures or if the textual styles and styles aren’t applied to content. Website pages load in a sequence of steps according to the program and get all the assets (pictures and CSS documents, JavaScript records and so forth). Below are the five main steps that determine how a page renders.

  • DNS Lookup – Find the web address of the asset (for example,
  • Start Connection – Effectively conversing with the asset’s location
  • TTFB (time-to-first byte): Accepting the absolute first snippet from an asset (for instance, the principal snippet from Optimizely’s CDN).
  • Download/TTLB (time-to-last byte) – This is the last bit of data that the asset has. It allows the asset to render (for instance, a picture) and execute (for Optimizely’s JavaScript bit)
  • Record Complete – The essential street sign that the site has completed stacking all of its assets

What Does CDN Optimizely Have to Do with the Steps To Be Taken?

Optimizely uses a Content Delivery Network, a network of web servers located all over the globe to administer the rendering of the scrap. Optimizely and its CDN only effect steps #3-5 because that is when the scrap solicitation has reached the CDN. Optimizely balances every solicitation to ensure it can transmit the bit from the most efficient CDN and physically closest server to the guest’s application. Optimizely’s stacking algorithm allows the piece to stack in the program as quickly as possible for any number of demands. Optimizely does not square different resources when stacking synchronously. Optimizely has a method to adjust CDN settings. You can read more about it here.

Optimizely gradually balances load between EdgeCast and Akamai, the fastest and most commonly used CDNs. Optimizely can also make site changes that take longer than Document Complete. This makes it easier to complete the full circle in TTFB as a component. This method significantly reduces the reaction time for 99% of site visitors and allows clients to increase their ROI from testing.

CDN Flashing and Optimized

Flashing is sometimes called flickering. It occurs when a page loads its original content for a brief time before loading other content. This creates a visible “flash” on the page. Flashing can cause disruption to website visitors and detract from the effectiveness of the content being tested. Optimizely requires you to consider the following: Placement on page; Synchronous versus Asynchronous loading; Tag manager; Snippet size.

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Evangeline Christina is a Cyber Security Enthusiast, Security Blogger, Technical Editor, Certified Ethical Hacker, Author at Previously, he worked as a security news reporter in a reputed news agency.


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