Feature	Cloudflare Workers	Fastly Compute	Spin	Cloud Run	Service Worker
Execution Model	V8 Isolates	WASI	WASI	Container	Browser
Cold Start	Very Fast	Very Fast	Fast	Slower	N/A
Max Execution Time	50ms-30s	60s	Varies	60min	Varies
Memory Limit	128MB	128-512MB	Varies	4GB+	Browser
Global Distribution	Yes	Yes	Platform-dependent	Regional	N/A
Cost Model	Per-request	Per-request	Platform-dependent	Per-request + compute	Free
Maturity	Stable	Stable	Stable	Experimental	Experimental