Replacing Google Optimize with the Vercel Edge Network

What this post added

This post introduces the use of Vercel's Edge Network, specifically Edge Config and Routing Middleware, to implement high-performance A/B testing and personalization strategies as a replacement for Google Optimize. It details how Edge Config provides sub-millisecond configuration read times and how Routing Middleware can serve correct page variants instantly to eliminate Cumulative Layout Shift (CLS). It also provides an example of tracking experiment results using a `saveData` function.