Enhancing the Optimizely Experimentation Platform with Cloudflare Workers

This post details how Optimizely leverages Cloudflare Workers to improve performance and agility for its experimentation platform. For client-side A/B testing, Optimizely uses Workers to offload decision logic to the edge, returning a small amount of JavaScript to the browser for specific page loads, thus avoiding browser bottlenecks and FOUC. For server-side feature rollouts, Optimizely centralizes the instantiation of its JavaScript SDK within a Cloudflare Worker, which acts as a decision service. This Worker can be called from applications to determine feature enablement for a given user, reducing the need for origin server requests and simplifying full-stack implementation for applications relying on heavy caching.