What? The size of a page has nothing to do with the CPU. Most of that size is going to be in images and animation, and most web pages put basically no load on your CPU. If one does it's going to be because of badly written JS, not because of the size.

Shrinking the average page size even by half is not going to "the web run faster on a large scale." Most of the time your page load speed is not affected by congestion, and if it is it's likely due to a local tower or something. The problem there will be the number of users per tower, not the size of the pages they are loading.