https://buildonaws.lakil.org/tags/prefetch/Recent content in Prefetch on Build on AWSHugoenFri, 12 Jun 2026 00:00:00 +0000https://buildonaws.lakil.org/posts/data-driven-speculation-rules/Fri, 12 Jun 2026 00:00:00 +0000https://buildonaws.lakil.org/posts/data-driven-speculation-rules/<h1 id="building-data-driven-speculation-rules-with-cloudwatch-rum-cloudfront-functions-and-kvs">Building Data-Driven Speculation Rules with CloudWatch RUM, CloudFront Functions, and KVS</h1> <p><strong>TL;DR:</strong> Speculation Rules API lets browsers prefetch or prerender pages users are likely to visit next. The challenge is predicting <em>which</em> pages. This post builds an automated pipeline: CloudWatch RUM collects real user navigation patterns, a daily Lambda job computes per-page top destinations and writes them to CloudFront KeyValueStore, and a CloudFront Function (viewer-response) injects a <code>Speculation-Rules</code> response header dynamically. Pages without data get a safe default (pointer-down prefetch). The result: near-instant page transitions powered by real user behavior data, zero application code changes required. Full Terraform code included.</p>