I know how to exclude a file or folder (directory) from Windows Defender in Windows 10. What I'm not sure about is whether this exclusion applies to all sub directories within that directory? It seems to me like it should, but I couldn't find anything from a quick Google search that revealed the answer. Thanks!
Update
I'm hoping to get some actual documentation for this. I agree that it seems like it should, but I couldn't find definitive source for the answer, other than my own assumptions.
Antimaleware Service Executable
spikes hard in little bursts slowing down the copy-operations. I'm guessing each file is being assessed as to whether or not it's in a white-listed location, so it's not scanning them but it's still slowing stuff down, just not as much as it would if it performed a scan on each file.