Animation Lag with Dual 4k's on a Maxed Out 2016 13" MBP

Discussion in 'MacBook Pro' started by Phatalbert1000, Apr 12, 2017.

  1. Phatalbert1000 macrumors member

    Phatalbert1000

    Joined:
    Mar 23, 2016
    #1
    Hey, all!
    As the title states, my maxed out 2016 MBP gets pretty laggy when connected to dual 4k's at 60hz, primarily when resizing or moving windows, and especially when I activate Mission Control. I also do a lot of screen clips through Evernote, and dragging the selector is painfully slow.
    Monitors are connected on the Caps Lock side of the computer via two DisplayPort adapters.
    Is this just what I get for not getting a 15" with discrete graphics?
    Thanks in advance!
     
  2. Brookzy macrumors 68040

    Brookzy

    Joined:
    May 30, 2010
    Location:
    UK
    #2
    Pretty much. It's a lot of pixels to push for integrated graphics.

    What displays are you using by the way?
     
  3. Phatalbert1000 thread starter macrumors member

    Phatalbert1000

    Joined:
    Mar 23, 2016
    #3
  4. Brookzy macrumors 68040

    Brookzy

    Joined:
    May 30, 2010
    Location:
    UK
    #4
    Where did you read that?
     
  5. Phatalbert1000 thread starter macrumors member

    Phatalbert1000

    Joined:
    Mar 23, 2016
    #5
    Here: https://support.apple.com/en-us/HT207256

    MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) supports Thunderbolt 3 at full performance using the two left-hand ports. The two right-hand ports deliver Thunderbolt 3 functionality, but have reduced PCI Express bandwidth.
     
  6. Brookzy macrumors 68040

    Brookzy

    Joined:
    May 30, 2010
    Location:
    UK
    #6
    Oh, I see. This refers to the fact that the left two ports support full Thunderbolt 3 speeds but the right are limited to around (I believe) 20 Gbps. But all the ports provide full USB-C capabilities, so there is no difference for non-Thunderbolt 3 devices such as 4K displays.
     
  7. Phatalbert1000 thread starter macrumors member

    Phatalbert1000

    Joined:
    Mar 23, 2016
    #7
    Sorry to refresh an old thread, but I'm still tinkering with my setup.
    Is it possible to lower the refresh rate of the monitors to something like 45hz? 30hz is a little choppy, but the overall GUI performance is better (I tested this by hooking up via HDMI instead of DisplayPort). I've tried using cscreen but can't successfully get it to change the refresh rate of the monitors. I also don't see an option in display preferences or the dell monitors.
    Thanks!
     

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