Why jumping around in text is hard

Locking text files is *really unfriendly*, too. Shades of Windows.

(Note that less also sucks the whole file into RAM, so if it's huge less 
won't do the trick either.)

(Emacs doesn't do a lot of *formatting*, as such, but both the Emacsen 
*can* attach properties/extents/whatever to regions of buffers, and both 
also have to handle multibyte support to the extent of having single 
buffers with many encodings in. All of these things push up the memory 
consumption somewhat, especially the latter.)