I use iMac, but I use PS CS4. I don't use LR nor PS CS6.
As far as the general things, I don't use any anti-virus any more. I didn't upgrade my iMac at all, it's the normal spec that they give in the shop and I'd say that it's much faster than a PC in general. Opening PS CS4 only take a blink of an eye really…
Sorry I can't help you further, but I hope it helps.
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