NVME write performance with Bitlocker enabled

  • Thread starter Thread starter N.J.1988
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N.J.1988

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Dear Community,


I have installed a Corsair Force 510 480GB NVME drive, installed Windows 10 Pro on it and tested the performance with CrystalDiskMark.

Sequential Read of 1GB files: 3500MB/sec

Sequential Write of 1GB files: 2200MB/sec


Then I enabled Bitlocker for the C-drive and tested again.

Sequential Read of 1GB files: 3400MB/sec

Sequential Write of 1GB files: 550MB/sec


Bitlocker is running in software mode without using hardware encryption of the SSD as Microsoft recommends these days due to

encryption implementation issues of some hardware vendors.


Question: How is it possible that read speed remains roughly the same but write speed drops by this huge amount of MB/sec?

I'd understand a 10% drop in throughput, but not this much.

Has anybody experienced the same behaviour and/or investigated further? Maybe there is a setting I am missing?

I am running a i9-9900k@5GHz with 32GB DDR4-3600 memory.

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