A good editor can handle them without any trouble. I just downloaded Moby Dick from Project Gutenberg and opened it in Emacs. It opened instantly, I could immediately go the end (line 22333), scroll around, count the words (there are around 222617), count the ocurrences of the word 'whether' (there are 91, the last of which is on line 21769), make a change somewhere in the middle. All of this is instant.
You can do all that instantly in Vim too (... and I just checked to make sure). A megabyte of text is just not a lot of text for a good editor.
You can do all that instantly in Vim too (... and I just checked to make sure). A megabyte of text is just not a lot of text for a good editor.