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I have a question for windows behavior. I was running a bunch of applications in my xp, they run smoothly at that moment. Then I leave my machine alone for some time, say a night, a few hrs, when I come back, the machine will be very slow (loading sth), for a few minutes, then it come smooth finally.

I would like to know why it would slow when I leave the machine idle for some time (surely not hiberate)

What does the windows scheduler do? I guess it is some of the memory allocation problem.

Thanks Kit

Kit Ho
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5 Answers5

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Could be power management turning your hard drives off after 30min, try experimenting with changing those settings, like making them a short time and see if the symptoms happen sooner, and try making them longer and see if the symptoms come in later. See if the symptoms match the time set there. I can't guarantee that that causes that symptom but perhaps it does. You'd find out if you try that test though.

barlop
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It sounds like the system is indeed defragmenting the drive while it’s idle. Once you press a key or mouse button, it may take Windows a moment or two to stop defragging. If it bothers you or is problematic, you can turn it off.

In Windows XP, you can edit the registry or just use TweakUI:

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(In Windows Vista and up, you need to delete the task or uncheck the Run on schedule option in the Defrag program.)

Synetech
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I would like to know why it would slow when I leave the machine idle for some time (surely not hiberate)

It is because the system was idle for a while, so Windows paged out the memory of most of your programs to disk. As a result, when you start using them again, it has to page all of that back into RAM which means that for a while (a few seconds to a few minutes depending on how much memory needs to be read and the speed of the disk and location of the swapfile), it will be slow and sluggish. Once the memory is read back into RAM from disk, the system should start getting more responsive again.


What does the windows scheduler do? I guess it is some of the memory allocation problem

The Task Scheduler is exactly what its name implies: it lets you schedule programs to be run at specific times or under specific circumstances, and then runs them. It has nothing to do with your issue.

Community
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Synetech
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The only exact way to know is to view the task manager panel's process tab, sorted by CPU usage. Most likely a full disk scan by your virus checker is chugging along and takes a few seconds to shutdown.

jdh
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The Windows task scheduler will run what ever you schedul it to run when you schedule it to run, it sounds to me like you are just wondering: IF windows is running something while you are away rather than: windows IS running something while you are away

Or atleast that is how I read your question, to answer my interpretation I don't believe there is anything that windows is doing; obviously the computer will go into some what of a 'sleep' state or "System Idle Process" if you will were it just sits there and twiddles it's thumbs.

My theory on the return to active duty delay (which most of us probably encounter) is that windows has to figure out where it left off especially if you left programs running and if they are 'heavy' programs at that it has to check all the RAM data and the exe's read HD's figure out graphics settings as it changes over from screen saver to the UI; your probably entering your password for user login so it has to check all that,

The list goes on, simply saying that even though all these sound simple (especially for a computer that has electrons flowing at the speed of light) however it still takes time; plus as the system sits idle it builds up heat heat slows the system down and so on.

Well that's my two cents worth, no official knowledge behind this one just a theory.

Iceking007
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