After the previously posted of “thieving gits” in 2009, I now encrypt my laptop, and was prepared to take a performance hit for it, and this is just fine.
For the OCZ Agility 4 I just got (AGT4-25SAT3-512G) – this is the “411”, as they say here. Without encrypting, blackmagic speed test was 208MB/sec write, 252MB/sec read. Encrypted with Filevault, it’s 196MB/sec write and 215MB/sec read, which is good enough, especially considering I was getting about 40MB/sec read/write on my encrypted 5200RPM HDD (vs 70MB/sec read/write on my wife’s unencrypted 7200RPM HDD)
One of the pieces of advice I’ve seen about SSDs is to not encrypt them because the extra write cycle will wear them out quicker, incompressible data leads to slower transfer rates, garbage collection/trim will slow them down, etc. Well, that hasn’t been my experience, and these concerns are even addressed specifically for this drive.