When the web was young and most people were on dialup, having access to a T1 meant that everything happened nearly instantaneously. All the sites were optimized for dialup levels of complexity. Now that everyone has broadband there is no equivalent. The slowness is either because the page is so heavyweight in terms of memory or processing power (note that more money does not buy much single-threaded performance), or because it's making so many network requests that everyone faces at a similar latency.

Even the fastest computer and the highest-end Internet access can't get you such a huge advantage in performance that it can make the web feel snappy again.