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How to speed up boot process under Windows Vista or Windows 7

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ATTENTION: The guide only works if you use HDD (NOT a SSD!).

To get started you need the Windows Performance Tools Kit. Read here how to install it:


If you are a Windows 7 User:

Make sure that EnablePrefetcher and EnableSuperfetch registry settings are set to 3 and that the Superfetch service (sysmain) is running and set to start automatically.

Also install those Windows 7 hotfixes:


If you are a Windows Vista User:

Make sure that EnablePrefetcher and EnableSuperfetch registry settings are set to 3 and the ReadyBoost service and that the Superfetch service (sysmain) are both running and set to start automatically.

Now open a command prompt with admin rights ( http://windows.microsoft.com/en-US/windows7/How-do-I-run-an-application-once-with-a-full-administrator-access-token ) and run the following command:

xbootmgr -trace boot -prepSystem -verboseReadyBoot

Now your PC will be restarted 6 times. After the second reboot the MS defragmentation program is running and is placing the files into an optimized layout, so that Windows will boot up faster (for the description read what ReadyBoot is). The last Reboots are training of readyBoot. After the training is finished, you'll notice a huge improvement in startup.



With Windows XP, MS implemented a prefetcher which loads data into the RAM, when the CPU was busy, starting services, drivers, so that they are already loaded when they are needed in later stages of the boot process.

With Vista, MS improved this prefetcher and named it ReadyBoot:

Windows Vista uses the same boot-time prefetching as Windows XP did if the system has less than 512MB of memory, but if the system has 700MB or more of RAM, it uses an in-RAM cache to optimize the boot process. The size of the cache depends on the total RAM available, but is large enough to create a reasonable cache and yet allow the system the memory it needs to boot smoothly.

After every boot, the ReadyBoost service (the same service that implements the ReadyBoost feature just described) uses idle CPU time to calculate a boot-time caching plan for the next boot. It analyzes file trace information from the five previous boots and identifies which files were accessed and where they are located on disk. It stores the processed traces in %SystemRoot%\Prefetch\Readyboot as .fx files and saves the caching plan under HKLM\System\CurrentControlSet\Services\Ecache\Parameters in REG_BINARY values named for internal disk volumes they refer to.

The cache is implemented by the same device driver that implements ReadyBoost caching (Ecache.sys), but the cache's population is guided by the ReadyBoost service as the system boots. While the boot cache is compressed like the ReadyBoost cache, another difference between ReadyBoost and ReadyBoot cache management is that while in ReadyBoot mode, other than the ReadyBoost service's updates, the cache doesn't change to reflect data that's read or written during the boot. The ReadyBoost service deletes the cache 90 seconds after the start of the boot, or if other memory demands warrant it, and records the cache's statistics in HKLM\System\CurrentControlSet\Services\Ecache\Parameters\ReadyBootStats, as shown in Figure 2. Microsoft performance tests show that ReadyBoot provides performance improvements of about 20 percent over the legacy Windows XP prefetcher.




If you remember XP days, their was a tool called BootVis. The optimization is similar to this here, but the difference is, that is only starts the integrated MS defragmentation program for a better HDD layout, because XP doesn't have ReadyBoot.

To see the improvement in time, run those 2 commands:

xperf -i bootPrep_BASE+CSWITCH_1.etl -o 01_summary_start.xml -a boot
xperf -i boot_BASE+CSWITCH_1.etl -o 02_summary_end.xml -a boot

To determine the boot time, open the XML files and look at the value bootDoneViaPostBoot. This value (-10000 = 10seconds) shows you the time, which Windows needs to boot completely.

In the file 02_summary_end.xml it should be much lower.

I hope this small tutorial helps you to make your Windows start faster.

Edited by MagicAndre1981
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Startup went from 42s to 30s. Until now, that seems to be the fastest it can go.

It did crash however when it ran an additional step after the 6. Something about the user, I haven't taken the time to look at it, wierd, because I'm an admin on my pc.

I'll give it another run when I have more spare time.

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  • 3 weeks later...

ok now i get a different error (strange)

The message is btw in dutch

und ich glaube das sie das nicht lesen konnen :P (bad german)

it now says >"-boot"is unrecognised <

try some other commands

ps is there a way to post pics on this forum without uploading them to a strange server?

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