With Google's new mobile algorithm imminently approaching (21st April) I thought I'd run my site through the test, but I was really surprised with the results.
My opinion is that Nodebb is blisteringly fast, it's one of the reasons why I chose it because the pages load instantly, however the speed test says otherwise for mobile devices.
This isn't a criticism, just thought it might give some valuable insights.
65/100 - for mobile speed
100/100 - for user experience
see here to test your forum
Google has published guidelines that emphasize why sites should deliver above-the-fold content in less than a second, but add that ...
“…the whole page doesn’t have to render within this budget, instead, we must deliver and render the above the fold content in under one second, which allows the user to begin interacting with the page as soon as possible."
No doubt implementing this wouldn't be easy, but it might be worth considering for future versions.