I have a macbook pro running windows 7 and I use a 1080p monitor when at home with laptop screen disabled. When I have my second monitor plugged in (via mini display port -> VGA apple adaptor) there is a lot of UI lag.

Nvidia 650M GT oc'd

i7 quad core hyper threaded 2.7 -> 3.6GHz



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Turbo boost (3,6GHz) only boosts one core. The others sleep, I guess. So I guess you shouldn't use the boost here. RAM is okay, unless rendering, graphics card isn't used anyway. I use mini-display-port on my System as well, no problem. But im on windows so maybe it's a MAC's problem. Please check out other programs, like Video editing Programs or other comples ones like photoshop. (there are free trials)

  • $\begingroup$ Photoshop runs fine, vegas runs fine, afert effects runs fine. Are you sure turbo boost only boosts one core? Because I remeber looking at all my cores through a diagnostoc tool (cant remember which but it was probably CPUZ) and seeing all the cores increase in clock. RAM has been fine for rendering, only problems are when I want to run huge fluid sims.I am on windows 7 and belnder is 64bit btw. $\endgroup$ – Lukeme9X May 7 '15 at 7:11
  • $\begingroup$ pretty sure... check en.wikipedia.org/wiki/Intel_Turbo_Boost There is a table with some caclulations. Seems you 'can' boost more than one core, but only moderate. so 3,6GHz boost would be only 1 (my guess) (I only read "macbook" so I thought you were running Blender on Mac Os.. But you already mentioned windows in the 1st post, so.. my bad.) wild guess: search in your bios for "HPET" and set, if it's there, to 64bits. (double-check if you are using Blender in 64bit edition) $\endgroup$ – KYL3R May 7 '15 at 19:08
  • $\begingroup$ I have no BIOS, it's a mac remember. Blender is definitely 64 bit, shows up without the 32bit indicator in task manager. May I ask what HPET actually means? $\endgroup$ – Lukeme9X May 7 '15 at 23:06
  • $\begingroup$ HPET : High Precision Event Timer. Some Nvidia cards seem to lagg without this. sorry, of course no bios. it's EFI on mac then. $\endgroup$ – KYL3R May 9 '15 at 13:07

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