It seems industry-wide these days.

What I’ve seen as an older-than-average developer is that the Agile movement has made it increasingly difficult to make time for paying attention to some of the more subtle aspects of user experience such as performance. Because I can’t predict how much work it will be accurately enough to assign story points to the task, and that means that this kind of work frequently results in a black spot on our team performance metrics.

CD makes it even harder because this kind of work really does need some time to bake. Fast iterations don’t leave much time to verify that performance-oriented changes have the intended effect and no adverse side effects prior to release.