Apple treats Safari like it is a document-viewer, displaying documents of varying graphical and visual complexity. OS X's vibrancy effect typically helps you anticipate upcoming content, get a sense of context, smoothly transition between content and chrome etc. This is how the vibrancy effect appears: But most popular webpages are more complex: they have fixed toolbars, search boxes, etc. at the top of the page. Think YouTube, for example. The vibrancy effect only appears above this, in the window chrome, after the relevant graphic has already scrolled out of view. Thus when the colours reappear, they are more of a distraction then anything. This is how the vibrancy effect appears when navigating YouTube: Obviously, in practice, motion is a factor. This works in favour of simple webpages, where the content subtly bleeds away into the chrome and fades into the top of the display. However, motion probably increases the distracting nature of the vibrancy on complex webpages, where seemingly-random colourful patches will appear to speed up and down past the large, colour-free header fixed at the top of the page. Apple’s view of webpages as colourful documents plausibly stems from its push towards apps as the houses of complex content, and its general lack of investment in pushing the ‘web’ forward. It’s interesting to see how they overcome this problem on their own website, which itself has a fixed menu bar at the top. This menu bar is weakly transparent, so content never disappears and then reappears in Safari’s chrome - it smoothly transitions from in-focus to partially hidden by the opacity of the menu bar to an abstracted splash of colour once behind Safari’s chrome. Thoughts? Has anyone had the same experience with distracting vibrancy in Safari (versus elsewhere in the system)?