Microsoft: Windows 7 upgrade can take nearly a day

posted onSeptember 13, 2009
by hitbsecnews

While developing Windows 7, Microsoft ran many different performance tests to make sure the operating system was an improvement over its predecessors. One of the tests focused on upgrade performance: Microsoft wanted to make sure that an upgrade from Vista SP1 to Windows 7 was within a five percent threshold faster than an upgrade from Vista SP1 to Vista SP1. Microsoft gave three reasons for using the Vista SP1 to Vista SP1 upgrade as a baseline instead of Windows XP to Vista:

  • Windows XP is a vastly different operating system compared to Vista and an upgrade from
  • Windows XP -> Vista would not be a good comparison with Vista -> Windows 7
  • Windows XP did not support 64-bit upgrades and we wanted to track 64-bit upgrade performance as well as 32-bit upgrades for Windows 7
  • Vista SP1 -> Vista SP1 is a valid upgrade path that exercises all upgrade code (this upgrade is commonly used by Product Support Services for a repair scenario)

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