system() slow in Win10 Pro, but not Home

I have two machines with fresh gVim 8.0.2 32-bit installations on Windows 10 Pro and Home, respectively. A call to `system()` (e.g. `echom system('whoami')`) takes about a full second on Win10 Pro; a shell window opens and closes before the result appears. On Win10 Home the result of the call appears instantly and no window is opened.

I would expect the result to appear instantly in both cases.

On IRC, somebody suggested looking at shell and shellcmdflag, but those variables have identical values on both systems:

shell=C:\WINDOWS\system32\cmd.exe
shellcmdflag=/c

How can I go about diagnosing the difference between the two systems?

Best,
Severin

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