External 4k Monitor Windows very Slow

Discussion in 'Installation and Configuration' started by DavideS2, May 18, 2018.

  1. DavideS2

    DavideS2 Bit Poster

    Messages:
    4
    Hi, I have a problem with my external monitor.
    My configuration is:
    macOS High Sierra 10.13.4
    Parallels Desktop 13.3.0 (43321)
    MacBook Pro 13 inch 2017 (3.1GHz i5).
    Using Windows 10 with the MacBook monitor everything works perfectly. Instead, using my Samsung LU28E85KRS external monitor connected via USB C to DP, the system becomes very slow.
    Parallels is currently set up as follows:
    Configuration Game
    CPU 2 Core
    4GB Ram
    1GB video memory.
    Does anyone know how to solve it?
     
  2. Arun@Parallels

    Arun@Parallels Parallels Support

    Messages:
    1,092
    Hi @DavideS2 , please let us know how much free space you have on your Mac.
     
  3. DavideS2

    DavideS2 Bit Poster

    Messages:
    4
    Hi Arun, thank you. I have about 120GB free of 500GB. If I run windows with a FullHD external monitor everything going good.
    Buh with the 4K external monitor Windows run very slowly :-(
     
  4. DavideS2

    DavideS2 Bit Poster

    Messages:
    4
    I retried to connect a full hd monitor and everything works fine now. So the system becomes very slow only when I use an external 4K monitor.
    How can I do? Please, help me, thank you!
     
  5. MichaelW39

    MichaelW39 Bit Poster

    Messages:
    3
    I'm experiencing the same problem - Macbook pro 2016 w Touch bar. External HD monitor works fine - 4K not...
    Parallells - don't drop the ball on this issue please.
     
    DavideS2 likes this.
  6. Arun@Parallels

    Arun@Parallels Parallels Support

    Messages:
    1,092
    Hi @DavideS2 , please check if you experiencing the slow performance issue only with Parallels Desktop for Mac or any other application while using external monitor.
     
  7. DavideS2

    DavideS2 Bit Poster

    Messages:
    4
    Hi Arun, if I use windows in bootcamp or macos with a 4k external monitor the system run very quickly. The problem is only when I use Parallels Desktop for Mac with Windows 10 VM.
     
  8. MichaelW39

    MichaelW39 Bit Poster

    Messages:
    3
    I only experience the problem with Parallells and only when connected to an external monitor.
     
  9. PaulChris@Parallels

    PaulChris@Parallels Product Expert Parallels Support

    Messages:
    2,951
    Hi @MichaelW39, please start the virtual machine, go to Devices (From Mac menu bar) and select "Network 1" to choose Shared Network, and check out the performance of Windows virtual machine in an external monitor.
     
  10. MichaelW39

    MichaelW39 Bit Poster

    Messages:
    3
    That is the setting I'm using already. I have mean time noticed that I can improve performance by changing the resolution on the external monitor to a non 4K resolution - pretty useless though.
     

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