For ages now, whenever I watch a video on YouTube, it usually freezes up or slows down Safari a LOT. It only happens while the video is loading, so usually when it's a long video, Safari will be extremely slow until the video finishes downloading. However, I don't have this problem on Chrome. Does anyone know what may be causing this? And how I could fix it? Safari is my main web browser, so I'd like to have YouTube functioning properly on it.