A site owner usually notices website performance problems in the same way customers do. A page takes too long to load, the layout jumps as buttons move under a finger, or a checkout screen hesitates right when someone is ready to convert. By that point, the issue isn't technical anymore. It's commercial. Website performance optimization used to sit in a narrow lane, mostly treated as a developer concern or an SEO clean-up task. That view is outdated. Speed now affects…