No, the file is not on a network; I don't get why you are in such disbelief... HN complains about a lot of things, but this is pretty cut and dry. I just opened a 2.4MB, 28425 line file containing LLVM IR, and it locks up just scrolling through the file, and the highlighter totally gave up and none of it is colored no matter how many times I try to get it to highlight it. Cutting it down to 5k lines gets me highlighting.