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Bitlocker performance drop on SSDs?

I installed the OCZ Vertex Plus 120 GB SSD on a Dell E6510 laptop that requires bitlocker by IT policy. I took benchmarks before and after and noticed a huge drop in some performance numbers. Is this normal?

BEFORE BITLOCKER
https://lh3.googleusercontent.com/-wJaqTiLHRcM/Tt5HF3-ZyMI/AAAAAAAAFkw/onli6l400Co/s800/V3.0.1b_PRE_BITLOCKER.png

AFTER BITLOCKER
https://lh3.googleusercontent.com/-fSq36AkzNS4/Tt5HHb-rSKI/AAAAAAAAFk4/Ggrlf8j2EPc/s800/V3.0.1b_POST_BITLOCKER.png
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  1. Best answer
    Considering bit locker is drive encryption - you will probably get a performance decrease with it. Although taking that big of a hit is pretty weird.

    If you don't notice the difference with it anyways - I wouldn't worry about synthetic benchmarks too much especially if you cannot see the difference yourself.

    http://forum.notebookreview.com/lenovo-ibm/216904-bitlocker-performance-hit.html
  2. It felt weird, esp. that read performed dropped more than write performance and i have a core i7 on the laptop. I didn't use the system much before I encrypted the drive, but I did sense a slight drop in performance. Of course, both beat the socks off the regular hdd I had before. I wonder if over provisioning can help.
  3. Best answer selected by vvume.
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