I just bought myself a Samsung 850 EVO ssd for my macbook mid 2009 a1181 and I have no performence benefits so what ever actually I think it might be slower I was just curious if anyone knows a fix to this. One thing I noticed is that during boot the mac seems to hang at the white screen before the apple logo appears for a good 30 sec but after it gets by that everything else moves smoothly.*Note I did not do a clean install I just cloned my mechanical hdd to the ssd* ~Thanks. Countmaxmore