About a billion Edge Functions run on Netlify every day — Sunweb personalizing pages, Loto-Québec routing traffic on a cookie check, and hundreds of thousands of other sites doing everything from personalization to routing to auth. All of it runs on a full JavaScript runtime that scales with our customers’ traffic. This poses a significant technical challenge, as we strive to make the latency as low as possible. To run tens, sometimes hundreds of thousands, of edge functions per second, we need ...