FYI I'm currently mitigating this using Bumblebee:

I've not yet been able to get applications running against the discrete
chip, but since I'm now running with onboard Intel graphics the
stuttering is no longer an issue.

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  Dell XPS 9530 (Nvidia GeForce GT 750M): Intermittent freeze when using

Status in linux package in Ubuntu:

Bug description:
  I am on an Dell xps 9530 laptop and I had recently cleaned installed
  17.10. A few days back I decided to updated to 18.04 to check it out
  and report some bugs. The most annoying bug so far is the insane
  amount of input latency this update has brought with it to a degree
  that it makes it impossible to be productive. The issue is observable
  when using either the mouse or the keyboard. The mouse does not move
  immediately but it needs a second or two to register and start moving
  and even then at some point it freezes for half a second at some
  random point and then moves again. Also if I have two applications
  side by side and I try an move focus from one to the next at around
  the edges of each window the mouse freezes for a second and then
  moves. The keyboard freezes if it hasn't been used for a while and on
  the first keystroke will take a second to register and for a bonus you
  get the first keystorke repeated for around 15-30 times. So if you are
  trying to write "and" will become "aaaaaaaaaaaaaaand" or pressing
  "ctrl + T" in the browser will open not one but 20 tabs!

  I am reporting it here cause I am not sure what is causing all this
  latency (it could be libinput or something else entirely) but please
  try and fix this as soon as possible!!

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.28.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Mar 19 13:04:05 2018
  DisplayManager: gdm3
  InstallationDate: Installed on 2018-02-14 (32 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to bionic on 2018-03-15 (3 days ago)
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC0:  giannissc   2031 F.... pulseaudio
   /dev/snd/pcmC1D0p:   giannissc   2031 F...m pulseaudio
   /dev/snd/controlC1:  giannissc   2031 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=999e9885-dbd2-4a45-a45f-998e322f32dc
  InstallationDate: Installed on 2018-03-26 (2 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180325)
  MachineType: Dell Inc. XPS 15 9530
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-13-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
   linux-restricted-modules-4.15.0-13-generic N/A
   linux-backports-modules-4.15.0-13-generic  N/A
   linux-firmware                             1.173
  Tags:  wayland-session bionic
  Uname: Linux 4.15.0-13-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True 01/08/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08 XPS 15 9530
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A08
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
dmi:bvnDellInc.:bvrA08:bd01/08/2015:svnDellInc.:pnXPS159530:pvrA08:rvnDellInc.:rnXPS159530:rvrA08:cvnDellInc.:ct8:cvrNotSpecified: XPS 15 9530
  dmi.product.version: A08
  dmi.sys.vendor: Dell Inc.

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