This could be helpful if you have several Windows 10 devices in your home, so that you don't need to download the updates several time over the internet.
the trace is too large to be opened with my 16GB of RAM in my laptop. That large volume shadow copy can indeed cause boot issues. I've seen similar things.
a lot of DPC usgae comes from the AMD AHCI driver amd_sata.sys. Try the latest version: http://support.amd.com/en-us/download/chipset?os=Windows+8.1+-+64