There is a delay before check the latest version

[zyxkad]

What did I do

1. Register PWA as autoUpdate, and register service worker with immediate: true
2. Load the page once on the client
3. Change something in the page, and update the change to the server
4. Reload the client

Actual Behaviour

After the page loaded, the client will wait for a second, then request sw.js and reload to update to the latest content.

Expect Behaviour

The client should not have any delay. It should immediately check sw.js after loaded.