The problem is that performance is a feature that is not on anyone’s product roadmap.
For whatever reason, the fact that it correlates directly to bounce rate, time on site, pages-per-visit etc. has not struck home with many product owners.
Most websites, certainly in the publishing industry where I have worked for a good part of my career, see those metrics as core KPIs. So you would think that anything that improved them would get prioritised. But no.