FileVault 2 was a big improvement over Apple's first attempt.
This link describes the performance impact:
http://osxdaily.com/2011/08/10/filevault-2-benchmarks-disk-encryption-faster-mac-os-x-lion/

Keith - CDI


> On Aug 2, 2017, at 12:47 PM, Jody Bevan via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> Chip:
> 
> Even longer than the hardware/firmware solutions there has been software to 
> do this. The performance hit is substantial though. I remember testing out a 
> software solution about 15 years ago with a compiled standalone version of 
> our application. Essentially with these they intercept the writing to the 
> hard drive for certain applications so that you do not have to do this for 
> all applications. It was substantially slower. Of course that was 15 years 
> ago, so this could have speeded up since then, especially with SSD. Still 
> though the hardware/firmware solution I could not see a difference in 
> performance between with it and without it.
> 
> Jody
> 
> 
>> On Aug 2, 2017, at 9:07 AM, Chip Scheide via 4D_Tech <4d_tech@lists.4d.com> 
>> wrote:
>> 
>> depending on the computer system.
>> This is built into (software) OS X it is called 'FileVault'.
>> I believe that Windows 7+ has a similar feature, but this might not be 
>> true at all, or only for newer (8 and or 10).
>> 
>> I do not have explicit experience (I'm sure Jody does), i would expect 
>> there to be some performance hit with Filevault, as it is software.
>> 
>> 
>> her is a link to an ARsTechnica thread about SSD encryption
>> https://arstechnica.com/civis/viewtopic.php?t=1243475
>> 

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