Automatic mirror selection should help you by presenting mirrors only from your country.
Mostly the closest mirror should be best for you, but if closest mirror does not have good bandwidth
then it is better to go for higher bandwidth mirror instead of closest. Feel free to use
Manual Mirror selection if you want to play around.
You can find the git repository of this code
ISCSI Support: Booting over ISCSI is 3 times faster than HTTP.
But for global ISCSI booting, we need support from ubuntu mirrors for providing