Comment 299 for bug 1470250

Update (no real results yet)
I tried to improve on the test cycle by stopping the hyper-v backup immediately after it has begun, then waiting until the delta disks have been merged back (rinse and repeat)
It took some time to get stable but it seems to have a 6-7x speedup compared to the original variant.
Currently running various kernels, unfortunately we have to rebuild parts of our test environment because it seems like cheap SSDs dont like 600TB writen to them...