Yes, it is practice. Is speed reading a useful skill in real life? Would it mean you missing things? A large part of fast reading is correct writing. You need correctly formatted and stylish code. Good variable names and proper spacing make the code so much easier to read, quickly or slowly. Maybe no programmer should strain their brain with poorly formmatted code, but should send it back to its maker immediately. We do that so etimes with posts here, asking people to improve their code legibility.