setup-toolchains is extraordinarily slow on Windows

qbs setup-toolchains --detect
Detecting MSVC toolchains...
  Windows SDK v10.0 detected:
    installed in C:\Program Files (x86)\Windows Kits\10
  Windows SDK v6.0A detected:
    installed in C:\Program Files\Microsoft SDKs\Windows\v6.0A
  Windows SDK v7.0 detected:
    installed in C:\Program Files\Microsoft SDKs\Windows\v7.0
    This is the default SDK on this machine.
  Windows SDK v7.0A detected:
    installed in C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A
  Windows SDK v7.1 detected:
    installed in C:\Program Files\Microsoft SDKs\Windows\v7.1
  Windows SDK v7.1A detected:
    installed in C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A
  Windows SDK v8.0 detected:
    installed in C:\Program Files (x86)\Windows Kits\8.0
  Windows SDK v8.0A detected:
    installed in C:\Program Files (x86)\Microsoft SDKs\Windows\v8.0A
  Windows SDK v8.1 detected:
    installed in C:\Program Files (x86)\Windows Kits\8.1
  Windows SDK v8.1A detected:
    installed in C:\Program Files (x86)\Microsoft SDKs\Windows\v8.1A
  MSVC detected:
    version 2010
    installed in c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin
  MSVC detected:
    version 2012
    installed in C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin
  MSVC detected:
    version 2013
    installed in C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin
  MSVC detected:
    version 2015
    installed in C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin
  MSVC detected:
    version 2008
    installed in C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\bin
Setting up profile 'MSVC2010_x86'.
Setting up profile 'MSVC2010_x86_64'.
Setting up profile 'MSVC2010_ia64'.
Setting up profile 'MSVC2012_x86'.
Setting up profile 'MSVC2012_x86_64'.
Setting up profile 'MSVC2012_armv7'.
Setting up profile 'MSVC2013_x86'.
Setting up profile 'MSVC2013_x86_64'.
Setting up profile 'MSVC2013_armv7'.
Setting up profile 'MSVC2015_x86'.
Setting up profile 'MSVC2015_x86_64'.
Setting up profile 'MSVC2015_armv7'.
Setting up profile 'MSVC2008_x86'.
Setting up profile 'MSVC2008_x86_64'.
Setting up profile 'MSVC2008_ia64'