Recently I've noticed a distinct lag when switching between pages, it appears that when you click on a link to go to another page, their is a fade-out animation that drops to about 50% opacity, it then hangs there for a short period of time, then loads the next page. Once you notice it, it's actually quite annoying. Because it feels like the browser is causing the animation to stutter. But trying in multiple browsers, they're all the same.
I know in days of past you had to add a delay to page load times due to render issues, but whatever is going on at the minute doesn't feel as fluid as it once did. Print screen with the point the opacity stalls and then jolts to the next page below: