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Neither of those things are true?

Also you are seriously comparing process startup time with the latency of a network call, or worse an llm call?

Yes, if the SaaS application needs to fork subprocesses for every little step of agentic workflows.

Welcome to CGIs, a great 1990's technology for Web applications.

We do that, and the cost of forking the cli vs the llm or network call is very small. It works really well.