Let’s take a look at all of the different Resource Hints we have available to us, real-world examples of how best to use them, and learn about some of the more obscure intricacies and gotchas that we need to be aware of if we want to really get the best out of them (and to make sure that we really are being smarter than the browser).

We believe that data from inactive tabs should be considered unnecessary and distorting the picture.

Interesting take, even if I find it ambiguous to use "FirstMeaningfulPaint" for a Custom Metric. The issue with data from inactive tabs once again highlight that one should always back up their RUM findings with Synthetic Monitoring.