Looks good, I'll give it a try, but I have to mention this plugin as it deserves all the praise it can get!:
https://github.com/jisaacks/GitGutter http://www.jisaacks.com/gitgutter
https://github.com/jisaacks/GitGutter http://www.jisaacks.com/gitgutter
EDIT: Here is the section on the read me about it: https://github.com/jisaacks/GitGutter#non-blocking-mode
I've done this with "big" files, as well as large folders and it works perfectly both locally and over a NFS share.
How many LoC are the files you editing?
It's quite nice, but I would turn off live updating, as that slowed things down a bit for me. Updating on save works perfectly fine.