Mac mini 2018 is sluggish

Discussion in 'Mac mini' started by ajaan, May 15, 2019.

  1. ajaan macrumors member

    Joined:
    Dec 15, 2013
    #1
    Got a i3 / 32 GB 2018 Mac mini three weeks ago. I don't do anything that demanding on it, just a few pieces of software, nothing much running in the background. I never really do anything that taxes CPU or GPU, no video or photo work. Everything is low level in activity monitor.

    I know this is very subjective, but it just feels sluggish and not snappy doing day to day stuff. Whether scrolling, typing, switching between apps, using the trackpad, swiping etc. Son is noticing it too (compared to his iMac). He describes it as 'laggy'.

    To compare, we got a 2014 rMBP (4 GB), 2015 rMBP (16 GB), 2015 rMB, 2017 MBA, and a 2018 27-inch iMac. All are nice and snappy and feel faster in day-to-day use.

    At the moment it doesn't feel like an upgrade -- any ideas? Kind of underwhelming.

    Crossed my mind it could be the driving the monitor that's doing it: 4K 28-inch Samsung.
    --- Post Merged, May 15, 2019 ---
    Just to add,

    I've got the 28-inch 4K scaled to maximum 'larger text'

    And I just read this on another thread:

    "I currently own a LG 27" 4k UK650 monitor and I'm wondering if by adding something like the gigabyte gaming box with RX 580 via thunderbolt 3 eGPU would help scale the LG UI to 1440 hiDPI without any lagging."
    I don't fully understand this, but does changing the scaling to 'larger text' make the UI more laggy, and that's what I'm experiencing?
     
  2. OldMike macrumors 6502

    OldMike

    Joined:
    Mar 3, 2009
    Location:
    Dallas, TX
    #2
    Have you checked what temperature your cpu is running at?

    I just watched this video earlier today, and he had the same exact issues with an i3 Mini. He replaced the thermal paste on the cpu and it seemed to make a big difference.

    If it seems like the issue and you don't feel like digging into the guts, perhaps you can see if you can swap it out with Apple.

     
  3. Stephen.R macrumors 65816

    Stephen.R

    Joined:
    Nov 2, 2018
    Location:
    Thailand
    #3
    It’s related to how macOS renders “usable” resolutions on HiDPI screens.

    Try setting it to “default” scaling and see if the sluggishness goes away. I wouldn’t have thought that was likely given you have 32GB of RAM.
     
  4. ajaan thread starter macrumors member

    Joined:
    Dec 15, 2013
    #4
    It's on default scaling. All temps normal.

    Figured it out. HDMI to HDMI on a 4K monitor is defaulting to 30 hz and can't be changed with this monitor or on the OS. Changing it to a USB-c to Display Port connection puts it at 60 hz.

    That's got rid of the UI lag.
     
  5. OldMike macrumors 6502

    OldMike

    Joined:
    Mar 3, 2009
    Location:
    Dallas, TX
    #5
    That is good to hear. I'm curious now that you have found the issue, what you think of the i3 Mini. I was looking at picking one up - but the video I posted above kind of scared me off.
     
  6. ajaan thread starter macrumors member

    Joined:
    Dec 15, 2013
    #6
    From what I understand it's a rebadged i5 from the 2017/18 iMac. It seems to the same chip as that in our 27-inch iMac.

    Single core performance was more important to me than multicore, so the i5 and i7 seemed overkill.

    Almost all of the time, the CPU is at at 3-10%. Just doesn't get stressed. I'm happy with it. I guess it depends what you do.

    I'm mainly working with databases, PDFs, text-based files, tabs etc. Usually have loads of windows, files, tabs open, so RAM was more important at 32 GB, I start to swap at 16 GB.

    Friend is an editor with a dual screen set up. He's got an i3 / 16GB, working with design files and copy for editing he's happy too.
    --- Post Merged, May 16, 2019 ---
    BTW. I had my 16 year old son put the 32 GB RAM in, buying it from crucial on Amazon, and saving almost £400 over BTO on Apple. He did it in 25 minutes and found it simple to do, except two screws on the logic board were tight and we had to hold the screw driver with pliers to turn it.
     
  7. WC7 macrumors newbie

    Joined:
    Dec 13, 2018
    #7
    I am happy with the base model i3 mini ... I am just running it with a 1080p 24 inch monitor. In fact, I have purchased an i3 mini for each family member! Now, I'm up to 4 minis. One mini has a 27 inch 4k monitor attached, another is running with a 40 inch TV monitor (and an Apple TV, too), another is with two monitors at work, and my most recent i3 mini has the aforementioned 1080p monitor.
    --- Post Merged, May 18, 2019 ---
    My mind is slower than any lag with the i3 minis.
     
  8. harriska2, May 22, 2019
    Last edited: May 22, 2019

    harriska2 macrumors 6502a

    harriska2

    Joined:
    Mar 16, 2011
    Location:
    Oregon
    #8
    Thanks for that. Mine is now generally above 98 and I’ve seen a couple cores hit 120-130 regularly. When I upgrade the memory we’ll redo the thermal paste. Is there a good brand?
     
  9. RyanXM macrumors 6502

    RyanXM

    Joined:
    Jul 7, 2012
    Location:
    DFW, TX
    #9
  10. ajaan thread starter macrumors member

    Joined:
    Dec 15, 2013
    #10
    It seems so variable. Mine was low 40s according to iStat, and always feels cool to the touch.

    Clearly, the single 4K monitor in my case. While things somewhat improved when I used USB-c to DP running at 60 hz, the UI was still sluggish.

    I've now got two 27-inch 1080p monitors running off the mini, and things are fast and instant. The UI is snappy. It's a pleasure to use again.

    I would like to try the new 24-inch 4k Ultrafine from LG on the Apple Store to see how that performs.
     
  11. harriska2 macrumors 6502a

    harriska2

    Joined:
    Mar 16, 2011
    Location:
    Oregon
    #11
    I also have a 4k monitor but I swore it is set to 60hz with 4-4-4 setting (40” Samsung). It can’t run youtube videos with a whole lotta halting. It used to run youtube at first just fine. 6 months later, not so much. I’m on hdmi to hdmi.
     
  12. ajaan thread starter macrumors member

    Joined:
    Dec 15, 2013
    #12

    You might want to check in the menu of the monitor. My Samsung 4K kept defaulting to 30hz on HDMI to HDMI, only running at 60hz when I switched to usb-c - DP.
     
  13. harriska2 macrumors 6502a

    harriska2

    Joined:
    Mar 16, 2011
    Location:
    Oregon
    #13
    Unfortunately my samsung only has hdmi. Unless you can convert hdmi to dp. But then I lose sound.
     
  14. WC7 macrumors newbie

    Joined:
    Dec 13, 2018
    #14
  15. opeter macrumors 68000

    opeter

    Joined:
    Aug 5, 2007
    Location:
    Slovenia, EU
    #15
    Yes, the Core i3-8100B 3.6 GHz is in very similar to a i5-7600 (3.5 GHz), just on a new socket.
    http://www.cpu-world.com/Compare/415/Intel_Core_i3_i3-8100_vs_Intel_Core_i5_i5-7600.html
    https://cpu.userbenchmark.com/Compare/Intel-Core-i5-7600-vs-Intel-Core-i3-8100/3890vs3942

    One of the big differences is, that the i5 has TurboBoost, with the i3 does not.
    --- Post Merged, May 27, 2019 ---
    Interesting ... this CPU is categorized as a mobile CPU, but with 65 W TDP?

    https://i.imgur.com/Qxbrh6c.jpg
     
  16. WC7, May 27, 2019
    Last edited: May 27, 2019

    WC7 macrumors newbie

    Joined:
    Dec 13, 2018
    #16
    That's interesting. Sounds pretty 'hot' for a mobile! Haha. Apparently, it has little to do with the TDP. Maybe it is the mounting? BGA?
     
  17. opeter macrumors 68000

    opeter

    Joined:
    Aug 5, 2007
    Location:
    Slovenia, EU
    #17
    I don't think, this is a mobile chip. It has the same characteristics as a desktop class CPU.

    This is the "original" Core i3-8100 CPU:
    [​IMG]
     
  18. Neodym macrumors 68000

    Neodym

    Joined:
    Jul 5, 2002
    #18
    There’s a reason why Apple significantly improved the cooling system in the 2018 mini
     
  19. Hessel89 macrumors regular

    Hessel89

    Joined:
    Sep 27, 2017
    Location:
    Arnhem
    #19
    you can also get an HDMI 2.0 cable. HDMI 2.0 allows for 4K at 60hz
     

Share This Page

18 May 15, 2019