Understanding the True Cost of Client-Side A/B Testing
Tim Kadlec
JANUARY 12, 2021
The Optimizely script is 133.2kb, and it’s loaded as a blocking script (meaning, the browser won’t parse any more HTML until it gets downloaded and executed). to download. Once it’s downloaded, we see some execution of the script (the pink block following the request). First Contentful Paint dropped from 4.4s
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