The Most Misleading Measure of Response Time: Average – Optimizely Blog

Any third party code snippet you add to a web page will impact its overall load time. This is because, in most cases, the third party code needs to finish loading before the rest of the page can begin to load. If the vendor providing the code is doing a good job, that impact should be so small that your visitors don’t notice it at all.Some vendors attempt to mitigate impact on load times by providing an asynchronous code snippet—in other words, a snippet that loads simultaneously with the rest of the page. This is primarily used for background services, like Google Analytics, where the code isn’t making a visible change to the page. In most cases, it isn’t appropriate to load the code snippet for an A/B testing platform like Optimizely asynchronously. This is because parts of the page may load before the snippet, causing the user to see the original page flash on the page and then change to the appropriate variation

via The Most Misleading Measure of Response Time: Average – Optimizely Blog.

via The Most Misleading Measure of Response Time: Average – Optimizely Blog.

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