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

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).