Cloudflare Worker Performance Kit

This skill provides a comprehensive approach to optimizing Cloudflare Workers and web applications for high performance. It covers caching at the Worker memory level, the Cloudflare Edge, and frontend parallelization.

Core Principles

1. Cache Public, Invalidate Private: Public GET requests should be cached at the edge. Private or admin actions must trigger targeted cache invalidation.
2. Memory > Network: Accessing module-level variables is orders of magnitude faster than querying Cloudflare KV or durable objects.
3. Parallel > Sequential: Fetching multiple resources simultaneously (using Promise.all) reduces the overall wait time for the user.

Implementation Guide

1. Multi-Layer Caching (Worker)

• In-Memory Cache: Use a simple Map in the module scope to store KV results for short durations (e.g., 30s).
• Edge Cache: Use the caches.default API to store full Response objects at the Cloudflare Edge.