Hi there,
I highly suggest reading through the flagged issues by Google PageSpeed Insight or Lighthouse like “Preload key requests”, “Ensure text remains visible during webfont load”, “Image elements do not have explicit width and height”, etc.
It’s great to read the details as well as it actually suggests the course of action in dealing with the issues flagged.
You can use the forums search text field for the flagged issues that Google PSI may flag on your site. 🙂