Choppy scroll on MBP 15 2017

Discussion in 'MacBook Pro' started by Luigi3, May 6, 2018.

  1. Luigi3, May 6, 2018
    Last edited: May 6, 2018

    Luigi3 macrumors regular

    Aug 11, 2012
    Hey there,

    I noticed that on most powerful config for MBP 15 2017 scroll experience is quite bad. I cleared cache, history(when I typed some sentence I had beach ball spinning) and still is the same. I have second MBP by my side - but it's MBP without touchbar 2017 base config - and scrolling looks fine.

    Any ideas what's going on?

    EDIT: I tracked the FPS on 13 and 15. On 13 average for scrolling macrumors is 55, for 15 is 40-44. So it's not an illusion or something.
  2. Falhófnir macrumors 68030


    Aug 19, 2017
    The 13 has iris plus integrated graphics, and a lower screen resolution, while the 15 has only HD 630 and a higher resolution - the integrated graphics will have to work quite hard to drive the display when it is set to draw an 3360x2100 image then interpolate it to a 2880x1800 screen resolution. So if you’re not doing anything that is engaging the dGPU this could well be the culprit. See if it is still there if you turn off switchable graphics and use only the dGPU
  3. Luigi3 thread starter macrumors regular

    Aug 11, 2012
    I'm not convinced. I'm pretty sure this is not a global problem since I've been searching about that and there were not that much topics about that.

    Second: the difference is not that significant to drop 10 frames per second. 2560x1600 vs 2880x1800.

    But yeah: I turned off graphics switching and has avg 57 frames.
  4. Kognito macrumors regular


    Jul 27, 2011
    Doesn't sound normal to me. Is the MBP 15 new?
  5. Luigi3 thread starter macrumors regular

    Aug 11, 2012
    I've got it for a couple of months.
  6. Falhófnir macrumors 68030


    Aug 19, 2017
    A lot of people talk about the animations for things like mission control lagging on the 15”, while it does seem extraordinary just scrolling could look jaggy it seems to be in the same vein. Remember despite the small sounding resolution difference the 15” is still working out what to do with an extra 2 million (virtual) pixels - a 40% increase over the 13”. Doing that 50+ times a second takes its toll!
  7. Luigi3 thread starter macrumors regular

    Aug 11, 2012
    Not really. Mission control needs to render all the windows in preview live at the same time, so it needs to be laggy on first try. Scrolling should not be an issue. For instance, iPhone plus is not laggy comparing to standard iPhone, even the resolution is much higher. I don't believe that:
    - It's a global issue
    - Apple could accept laptop for $3k to be laggy (plz don't raise the topic of keyboard).
  8. Patcell macrumors 6502

    Aug 8, 2016
    Bergen County, NJ
    Something is not right... I have a 2017 15" and I have absolutely no issue whatsoever with scrolling even through the most complicated of websites while running on integrated (HD 630) graphics. I would try reinstalling macOS and restoring from backup if you haven't already.
  9. Luigi3 thread starter macrumors regular

    Aug 11, 2012
    Yeah, just a followup:
    Apple Support suggested to create a new account and check it out. And... it actually worked, new account didn't have lag.

    I reinstalled the macOS, but it still had lag. So I closed all my tabs including the pinned ones in Safari and looks like it's back to normal.

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