I tried to use Headless Chrome on Cloud Functions for a project I'm working on, but even on the fastest instances loading pages was sometimes really slow (pages timing out after waiting for 60s).

It seems sometimes JS execution was taking a long time, so I guess that was preventing requests from being made. In a single CPU cloud function you have network requests, JavaScript execution, rendering, and the Node process controlling the browser all competing for resources.

That being said, it was super simple to get started!