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High CPU load when copying to/from network with Bitlocker enabled

Posted on 2010-08-25
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Hello Everyone

After I enabled BitLocker on my Dell E6400 laptop with SSD harddrive and Windows 7 64-bit installed, then I started getting high cpu load when I copy files to and from the network. Usually the high cpu load is only 1 out of 2 cores and its basicly 100% load on that core. Its most noticeable with larger files, the first 5 seconds usually goes full the speed, but then memory and cpu goes up and my computer gets really slow.

I understand that BitLocker needs to encrypt/decrypt data that is going in and out of the computer, but is my experience with BitLocker normal?
cpu-load.jpg
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Question by:DDK_Stephan
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by:firozmusthafa
ID: 33519455
perfectly normal, bitlocker is an industry standard protection, you have to pay for what you get(cpu power)
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by:DDK_Stephan
ID: 33519616
Thank you for your comment, but what about the fact that BitLocker is only running on 1 core during encryption/decryption?
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by:firozmusthafa
ID: 33519680
that's because bitlocker service is not multithreaded while your processor is multithreader(2 cores, right?), It's completely normal, because the encryption algorithm used cannot be multithreaded
Single threaded apps tend to draw power from single core only namely core0(most probably)
hope that clears your doubt
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Author Comment

by:DDK_Stephan
ID: 33519892
Indeed!! :-)
A last question: Would it be possible to somehow set the process priority for BitLocker on low? So my system wont go "bananas" when I do transfers from/to the network?
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firozmusthafa earned 2000 total points
ID: 33520090
ofcourse you can do it from taskmanager, go to processess and click on cpu usage header to sort in decreasing order to findout the bitlocker process, there you can right click and set cpu affinity(which core to use),cpu priority etc..
If you don't want to do it every time system starts, i suggest try ashampoo core tuner to set the priority of such processes to low permanently....
Hope that helps....
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