Will using FileVault 2 on the new MBP Retina SSD reduce performance?

Question

I read in an ArsTechnica article (http://arstechnica.com/information-technology/2012/06/inside-the-ssd-revolution- mobile-devices-and-modern-oss/3/) that the performance impact of using Full Disk Encryption on an SSD with a SandForce controller is potentially sizeable, due to the inability of the controller to identify wether data was eligible for deduplication. This is because when the SandForce controller analyzes data for homogeneity, similar files that would otherwise be deduped would be treated like unique data (the encryption makes them all unique). I know they mentioned that the delta was minor, but I'm interested in how minor it is, and they used the MBA for performance benchmarks.
So my fundamental question is this: Would I receive reduced performance on my SSD in storage capacity, longevity, or write speeds because of using FileVault 2, and if so, is there any inherent encryption built into the SandForce controller that would protect my data without the need for FileVault 2? This is a deciding factor that will determine if my MBP can be used for work or not.
*As a sidenote, please don't say that FDE isn't necessary or that I should go without encryption to solve this problem. I handle sensitive patient data that requires all of my work devices to be encrypted.*

Answer 1

I've been using FV2 on a 240GB OWC 6G for aboutr 6 momths. The disk is about 50% full. The performance is pretty bad as you can see - 105/177 MBs and I've contacted OWC to see if they have a view. But I'm about to turn FV off and see if the performance improves.