It's hard to say exactly, but it seems that there's some element on the page that won't fully load. When I bring up a page, it will say "45/45 Elements" in my address bar (which normally goes away once a page is fully loaded). While this is happening, I can't click on links and page scrolling is slow. If I hit the stop button, everything is normal, until I try to load another page. Opera has its own firebug-like console add-on, and according to that, everything appears to be downloading successfully. The error list is all css syntax errors, which I'm guessing are mostly normal, browser-specific workarounds. There are a few other sites that behave this way in Opera, so its not just Yuku. Pages load very quickly if I disable javascript, but unfortunately, that's not much of an option these days.