I thought vim slows down only because it starts counting the number of lines as shown in the status bar. You could Ctrl-c and file becomes responsive but if you

I thought vim slows down only because it starts counting the number of lines as shown in the status bar. You could Ctrl-c and file becomes responsive but if you try to save huge file, I once got it truncated to some small part maybe because I quit the editor too early or something. Why do people open very large files with a text editor? If it's a data file, you should grep/head/tail.