I agree with @pike, I had a fast download when I’ve tried.
I agree also with this.
We will look to some of the alternatives pointed by @dnutan.
Please be patient, we have been blocked by … marketing team 
There are already dozens of 7.8 around, but we couldn’t release the update packages because announcements are not ready yet 
I invite you all to update in the meanwhile using the following command:
yum update --enablerepo=nethserver-testing nethserver-subscription
signal-event software-repos-upgrade
The package from testing is already the stable one 