Case Study: Optimizely achieves 10-100x more concurrent experiments without performance impact with Cloudflare Workers (Cloudflare)

Optimizely Harnesses Cloudflare Workers to Reinvent Web Optimization

Optimizely, a leading experimentation platform used by enterprises like IBM and Microsoft, helps customers run tests to optimize websites and product experiences. Its traditional approach—delivering a JavaScript snippet in the page header—worked well but created a growing performance tradeoff: as customers added more experiments, the client-side script took longer to download and execute, risking slower page loads.

Optimizely rebuilt its implementation on Cloudflare Workers to run experiment logic at the network edge instead of in users’ browsers. By leveraging Cloudflare’s global edge network, the new approach lets customers run 10x–100x more experiments with no noticeable performance impact, accelerating product velocity and improving the value customers get from increased experimentation.

Optimizely

Lauren Pappone

Senior Software Engineer