Definitely very fast. I did a literature degree which included Old English (pre 1066) and a lot of mediaeval literature, as well as a lot of poetry etc. I now find reading novels written recently don't take long to read. I find that I can read several novels in a day when I have the time.
I have to admit that I have a habit of reading gripping books twice though, once to find out what happens because when I get really into a book I have to know and start reading even faster, and once to get every last detail from it!