The speed of my own reading depends on what I am reading. When reading an 800 page precise of 2000 years of British history,I had to slow down due to overwhelming data within. If you power read it I find something like that goes wrong. Too much dats. For an autobigraphy covering familiar material the speed goes up.

Even the British history book made my eyes open with how the Jews in Britain during the crusades would charge significant interest as the landed classes needed funding to fight for the Jewish 'homeland'. It didn't work well and those warriors came back furious at the debts and would sometimes hang Jews from trees. Even our old friend Jesus hated that kind of corruption, but he was more moderate than the Crusader types.