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They could build a page-transition graph: for each page, what are the links that people are most likely to click? This could let them figure out what the top one or two most common next-pages are, and those could be pre-loaded.

That would be more work for the GitHub guys, but I'm pretty sure it would work.

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Good idea, but _lots_ of work to implement it the right way.

Not to mention that the vast majority of Github repositories don't have enough traffic to properly build such a graph.

A reasonable fallback would be to look at the proportion of commits that touch files under each directory - the more active a directory is, the more likely it is to be of interest. Still probably not worth it in the majority of cases though.

I like that idea quite a bit, actually- I'm envisioning a sort of "heat map" UI, where each entry in a directory listing's background color is determined by its commit frequency.

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