• Still no answer to the source of Win7 slow scanning

    Posted on September 18, 2016 at 07:34 CDT by • Comment in the Forums

    It’s an interesting question: When did the Win7 update scan slowdowns start, and why?

    ch100 has been running extensive tests, starting with Win7 SP1, and using various methods to roll forward. Here’s what he says:

    Abbodi made a recent claim that the whole Windows 7 slowdown started with the October 2015 release of KB3095649.

    The idea is that WU agent 7.6.7600.320 which gets automatically installed first if there is no higher version installed on the system interferes somehow with KB3095649 which breaks the supersedence chain due to a Microsoft faulty implementation.

    I have a feeling that Aboddi is right about that patch, but I will try to prove  it by testing in simulated conditions with VMs and WSUS in which I will decline selectively patches after September 2015, after October 2015 and if finding a difference, selectively declining patches one by one until finding out what is going on…

    [Later]

    My tests have not proved anything unfortunately. I tested in few scenarios, with the original agent 7.6.7600.320 installed for all tests…

    There may be in fact differences between my WSUS testing  and Windows Update online, as I don’t have control over what is pushed from there.

    What I can say is that except for the fact that we have current workarounds which seem to work consistently (Canadian Tech & abbodi method and/or Dalai’s method which are not exclusive at all and can even be combined), we still don’t know how the slow scanning was generated in the first place.

    Anybody else have solid evidence, pointing to KB 3095649, or some other patch(es)?

    At this point the question’s largely academic, particularly with imminent changes coming to Win7 and 8.1 updating. But the Win7 update scan slowdown has led to the loss of hundreds of millions of work hours – and sucked up enough electricity to power a small city.

    Windows Patches/Security
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