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serverlessTechnical Profile

Fastly Compute

Edge compute platform running WebAssembly at the network edge with sub-millisecond startup

Architecture
Wasm-based execution on Fastly's edge network; compiles Rust, Go, and JavaScript to WebAssembly for isolated, sandboxed execution at CDN PoPs
Performance
Sub-millisecond cold starts with Wasm; low memory footprint; executes at CDN edge locations for minimal latency
Learning Curve
Moderate to high — Wasm compilation workflow and edge-specific patterns require adjustment from traditional serverless
Ecosystem
Growing ecosystem with Rust and Go SDKs; Fastly Fiddle for testing; integrates with Fastly's CDN and security services

What Is Fastly Compute?

Edge compute platform running WebAssembly at the network edge with sub-millisecond startup It is supported by Growing ecosystem with Rust and Go SDKs; Fastly Fiddle for testing; integrates with Fastly's CDN and security services with Moderate to high — Wasm compilation workflow and edge-specific patterns require adjustment from traditional serverless.

How Fastly Compute Works

Wasm-based execution on Fastly's edge network; compiles Rust, Go, and JavaScript to WebAssembly for isolated, sandboxed execution at CDN PoPs

Key Use Cases

  • Edge API processing and routing
  • Request/response transformation at the edge
  • A/B testing and personalization at CDN level
  • Authentication and authorization at the edge

When to Use Fastly Compute

Fastly Compute is a strong choice when your project requires Edge API processing and routing, Request/response transformation at the edge, A/B testing and personalization at CDN level. Fastly Compute delivers sub-millisecond cold starts with Wasm; low memory footprint; executes at CDN edge locations for minimal latency.

Strengths and Advantages

Performance
Sub-millisecond cold starts with Wasm; low memory footprint; executes at CDN edge locations for minimal latency
Ecosystem
Growing ecosystem with Rust and Go SDKs; Fastly Fiddle for testing; integrates with Fastly's CDN and security services maturity
Learning Curve
Moderate to high — Wasm compilation workflow and edge-specific patterns require adjustment from traditional serverless

Limitations and Considerations

Requires WebAssembly compilation step; JavaScript support via JS SDK is less mature than native Wasm languages; smaller developer community than Cloudflare Workers

Compared to Alternatives

Fastly Compute is often compared with other tools in the serverless space. Explore detailed side-by-side comparisons:

Fastly ComputevsCloudflare-workers
Fastly ComputevsDeno-deploy
Fastly ComputevsVercel-functions

All serverless Comparisons

Fastly ComputevsFly.io
Fastly ComputevsGoogle Cloud Functions
Fastly ComputevsNetlify Functions
Fastly ComputevsSupabase Edge Functions

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