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I'm assuming by Firebase you mean Firebase Functions? We have a fairly complex infrastructure running off a combination of Firebase's RTDB, Firestore, and Google Cloud Functions and have never seen anywhere near what you're describing. Are you sure you're experiencing a 7 second "cold start", or is the invocation simply taking 7 seconds to run? Because the latter is far more easily explained.

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I've confirmed that the actual execution of the function itself takes ~30ms, and that the time to download is standard (~200ms). That only leaves the cold start; nothing else makes sense.

edit: I even set up a node server on AppEngine itself, copied over the exact code to an endpoint, and it was taking 300-500ms tops (after the initial cold start of the AppEngine server).

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