I did this scroll bar thing 8 years ago at a job. It's quite an obvious strategy. You don't load all the data, but only what the user can actually see, with a

I did this scroll bar thing 8 years ago at a job. It's quite an obvious strategy. You don't load all the data, but only what the user can actually see, with a bit of buffer space in both directions. When the user moves the scrollbar you go and fetch more data. Not surprised that (1) somebody filed a patent on it and (2) it actually got accepted. Also maybe someone can show me where this "apparatus" cited in the in patent is to be found.