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I've got an absolutely fresh Windows 8.1 Pro x64 English UEFI which seems to work smoothly.

First of all, the preinstalled Windows Update client doesn't work at all today - just checking for updates for ages - until KB3138615 is installed.

When I am finally able to check for updates it appears that there are about 300 updates available with KB3000850 November 2014 update rollup among them, which requests KB2919355 already installed and forces to download KB3003057 and KB3014442 as it requires them also.

As at the moment I know nothing about KB3000850's craftiness I just select all the available updates and wait a couple of hours until the update process finished.

When my PC is ready I notice that the Welcome screen now takes 16 times longer (24 turns of welcome circle after vs 1.5 before) and there is 2 minutes 30 seconds of black colored emptiness between the Welcome Screen and the desktop appearance.

After some research I've found out that both delays are caused by KB3000850.

When I've downloaded each required update to install KB3000850 then no matter if I restart my PC after each update required by KB3000850 (including KB3000850 itself) or install them all during the same session I have the delays.

Also seems that installing all available updates through Windows Update doesn't solve the problem.

Delays appear each time I turn on or restart my PC when KB3000850 is installed.

Additionally I can no longer install KB3138615 after KB3000850. In this case KB3138615's standalone installer behaves exactly like Windows Update before applying KB3138615 - it endlessly checks the computer for installed updates.

How can I reduce the time taken by the logon process? I appreciate any suggestion other than "ignore KB3000850."

(I've researched a lot before asking, but the only troubles connected to KB3000850 were related to different kinds of crashes after applying this patch.)

The question: How can I get rid of that ~3 minutes pause between the logon screen and desktop appearance?

  • Install the WPT (part of the Win10 SDK: dev.windows.com/en-us/downloads/windows-10-sdk and also works for Windows 8.1), run WPRUI.exe, select First Level, under Resource select CPU usage, DiskIO, FileIO and under Performance Scenario select Boot. Number of iteration can be set to 1 and click to start. This reboots Windows and captures all activity during boot. After the reboot let the countdown tick to 0. Zip the large ETL file into zip/RAR file, upload the zip (OneDrive, dropbox, google drive) and post the share link here. I'll analyze what is slow. – magicandre1981 Mar 16 '17 at 16:46
  • Here is the log: filedropper.com/wpr. WPRUI was recording data over the 2,5 munute black screen. It is also possible to move mouse pointer and ctrl+alt+del during the black screen period. – YKKY Mar 21 '17 at 16:56
  • I see no delay. boot is done in 8s – magicandre1981 Mar 21 '17 at 17:18
  • + 24 turns of the Welcome circle and + 2,5 minutes of black screen each time the PC boots :) – YKKY Mar 22 '17 at 16:56
  • I can only tell you what I see in the trace. Here welcome is fast – magicandre1981 Mar 22 '17 at 17:10
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Load the ETL into WPA.exe, load the debug symbols, click on Profile->Apply, browse catalog and select the file FullBoot.Boot.wpaprofile. Now you see an overview on how long Windows boots:

enter image description here

In the ETL it shows 8.8s for full boot.

Capture several traces and analyze them as I described here. Maybe sometimes you see the slowness in the trace.

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  • Thanks for the research, really. I've stopped with MSDN image of Windows 8.1 Pro U3 - it has accepted the product ID embedded into my PC and seems to work fine. At the same time Windows 8.1 Pro U3 available for the end users at the Microsoft site ends up with endless black screen immediately after the installation. – YKKY Mar 22 '17 at 22:02
  • As for the 8,8 seconds boot time of my U1 upgraded to U3, I believe it boots normally but something takes 2,5 minutes after the boot is finished - I can move the mouse pointer during the black screen period and WPR interface appeared over that black screen also. I suppose it is something like "why not you try Windows 10 instead? it is better and there is no 2,5 minutes delay in Windows 10!" message from the Microsoft. – YKKY Mar 22 '17 at 22:07
  • after boot is a different thing. you ask for 2.5m delay at logon.2.5m after boot is startup issue. reduce the number of tool that you run automatically during logon. – magicandre1981 Mar 23 '17 at 15:46
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    you violate rules by asking question that I already answered some time ago. Here I explained in detail what happens. if you would do a search you would find that reply. So no research effort from your side, so downvote. that are the rules here. – magicandre1981 Mar 27 '17 at 16:00
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    @YKKY - You shouldn't about a downvotes, a single upvote, can counter 5 downvotes. So instead of being annoyed about a single downvote, take steps to improve your question, and go for the upvotes. – Ramhound Mar 28 '17 at 17:20

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