Poor[1] Javascript can hamper accessibility. Some people need to get the content in a way they can access. Sometimes those people will need to turn off bits of javascript to allow their assistive tech browser to find the content, or to allow their hardware to find the links for clicking, or to keep the user experience similar to what their used to, or etc etc.
Computers in 2012 are less powerful than a few years ago - many (most?) people will be using tablets or smart phones and thus using ARM processors with low clock speeds. Internet connection is also problematic. People may be using nice fibre-optic broadband with low contention. Or they may be stuck on dial up. Or in a country like Australia with very expensive connections. Or on mobile connections with poor bandwidth and high charges.
[1] I'm not saying this website's javascript is poor.
Computers in 2012 are less powerful than a few years ago - many (most?) people will be using tablets or smart phones and thus using ARM processors with low clock speeds. Internet connection is also problematic. People may be using nice fibre-optic broadband with low contention. Or they may be stuck on dial up. Or in a country like Australia with very expensive connections. Or on mobile connections with poor bandwidth and high charges.
[1] I'm not saying this website's javascript is poor.