Hash blob data while downloading (by trying to using page cache as much as possible)
instead of after, improving download speeds. Add configurable download concurrency
(default 48) and part size (default 64MB) for faster downloads on high-bandwidth
connections.
The file.Truncate call on windows will write the whole file
unless you set the sparse flag, leading to heavy I/O at the
beginning of download. This should improve our
I/O behavior on windows and put less stress on the users disk.
jmorganca
Daniel Hiltgen