i have-
2.5ghz i7 quad late 8,2 w/ 4gb ram.
-dell st2410 through the thunderbolt w/ apple adaptor (i haven't noticed issues external screen)
using owc mercury elite pro w/ 2tb seagate barracuda xt (via fw800)
-i use 500gb partition time machine , rest of drive media.
while, thought bluetooth (magic mouse + keyboard) causing lag , random beachballs.
disconnected , machine runs smooth without peripherals @ all.
of course, can guess fw800 external must causing lag.
machine lags whether or not if time machine running since must not tm. can't figure out smooth out lag.
of course, ran verify check external drive, , permissions internal drive.
besides- had 2.8ghz late '08 before i7 , can't recall having issues this.
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