Possible Duplicate:
Text editor to open big (giant, huge, large) text files
I’m editing an javascript library file which is over 20000 lines, I tried both notepad++ and Aptana, but they are too slow(particularly Aptana, an Undo operation will cosume 10 seconds)
So which editor or IDE are you using if the file is a little large?
Sublime text 2 can manage that huge quantity of lines:
http://www.sublimetext.com/2