I have a 17" mid 2009 mbp with 3.2 core 2 duo and 8gb ram. Upgrading to snow leopard to lion makes my computer slow but after upgrading my ram to 8gb it resolves the issue. I was hesitated on upgrading to mountain lion because the max. Upgrade on my mbp is 8gb only. And if mountain lion is memory eater. I will suffer again in beachball stuff. Will you recommend it?