How to fix "Lighthouse returned error: NO_FCP." when running Google Page Speed Test?

Question

I am running the Google Page Speed test for https://www.oceanluxe.com.au and get the following message:

> Lighthouse returned error: NO_FCP. Something went wrong with the recording
> the trace over your page load. Please run the Lighthouse again. (NO_FCP)
> (NO_FCP)

Can anyone help?

Tried on different servers, tried various URLs as well http://oceanluxe.com.au

Answer 1

Try to do a test again in incognito mode. I had the same problem today and clearing the cookies and cached files helped in my case.

Answer 2

I got the same error. It was because the page was not able to print anything on the screen within a stipulated time.I just printed something before time consuming code and that fixed the issue.

Answer 3

You can try this work around, it helped me:

First open "https://www.google.com/" or any good website URL then open you website URL. This may show two tabs mobile and desktop. The mobile tab may give same error so one should click on Desktop tab, it may show status of that URL.

Answer 4

Two things can interfere when using the lighthouse tool:

• Extensions used
• Cookies and cached files

Therefore a 'workaround' here should be straightforward:

• Clearing browser data:
  Windows, Linux, or Chrome OS ➖ Ctrl + Shift + Del
  Mac ➖ ⌘ + Shift + Delete

---

• Using an Incognito window:
  Windows, Linux, or Chrome OS ➖ Ctrl + Shift + N
  Mac ➖ ⌘ + Shift + N

Answer 5

A 15 second timeout has been introduced when considering the start of the page load. If your page doesn’t respond or any content within ~15 seconds, Lighthouse will bail. This will result in the NO_FCP error.

Until you are able to get your page to load within this timeframe, you won’t be able to do a scan. In most cases, if nothing appears on the page for 15 seconds, that means there is an issue on the server or a firewall is blocking access.