I have a unibody macbook pro (late 2008) with snow leopard. I replaced my mechanical hard drive with samsung 840 series ssd. I noticed significant speed improvements. I checked the read and write speeds using "Blackmagic Disk speed test" app. I was surprised to find that the actual read/write speeds were less than half as expected. Maximum write speed = 130 MB/s Maximum read speed = 250 MB/s. I also enabled trim using trim enabler app. But I still see the same speeds. Am I missing any optimization/step? Any thoughts are appreciated!