If I may add a little something to your list.

Advertisement clutter.

There is nothing more annoying then entering a sight with too much advertisement. It eats up speed and depending on the type of advertisement it can be offensive at times. Normally when a site loads and the first thing I see is advertisement I dismiss the sight.

Video Clips.

Video Clips can be informative but it is also bandwidth heavy thus a cap eater. So naturally when a 40mb video clips starts to load most “South Africans” will close the page and move on.