Compute@Edge's WebAssembly runtime is the most technically significant differentiator in edge computing. Teams using Rust or Go for performance-critical workloads can compile directly to Wasm and deploy to the edge without rewriting in JavaScript. Language portability is a genuine architectural advantage for systems teams.
Fastly Compute@Edge uses WebAssembly, enabling Rust, Go, and other Wasm-compatible languages at the edge.
Cloudflare Workers is more established and has a larger ecosystem. Fastly's Compute@Edge uses WebAssembly, allowing more languages at the edge. Fastly wins for teams using Rust, Go, or other Wasm-compatible languages for edge computing -- the language choice is a genuine differentiator that Cloudflare Workers's JavaScript-first model does not fully replicate.
Cloudflare Workers has a larger ecosystem, extensive documentation, and a more mature developer experience. For JavaScript and TypeScript teams, Workers is the more practical choice today. The Wasm support in Workers is improving but remains secondary to its JavaScript-first model. For JS teams, Workers is the stronger default.
Route-specific evidence
Fastly Compute@Edge runs WebAssembly natively at the edge. Any language that compiles to Wasm -- Rust, Go, AssemblyScript, C, and others -- can be deployed to the edge without a JavaScript intermediary layer. This is a fundamental architectural difference from Workers's V8 isolate model.
First-class Rust and Go SDKs allow systems teams to write edge logic in the same languages used for backend services. Shared types, libraries, and review processes between edge and origin code reduce cognitive overhead and integration surface area.
Fastly's Wasm runtime has no cold-start problem -- Wasm modules initialise in microseconds compared to JavaScript isolate initialisation. For latency-sensitive edge compute, this is a meaningful operational advantage.
Checks before publishing
Fastly
Confirm CDN architecture, purge SLA, VCL documentation, Compute@Edge language support, pricing model, and WAF capabilities at fastly.com and developer.fastly.com.
Cloudflare
Confirm CDN network PoP count, Workers Wasm support, WAF features, DDoS protection scope, pricing tiers, and Zero Trust integration at cloudflare.com and developers.cloudflare.com.
Buyer fit
Use Fastly when real-time cache invalidation, VCL control, Wasm edge compute, or usage-based billing are the primary decision drivers for the engineering team.
Exception
Use Cloudflare when network scale, free plan access, integrated security breadth, or JavaScript-first Workers ecosystem outweigh Fastly's precise CDN control advantages.