Hi, I still have this issue. Using Ubuntu 18.04 on Dell XPS 9570.
Any way to get a workaround for that?

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  Adjusting display brightness is very slow on several Dell laptops

Status in linux package in Ubuntu:

Bug description:
  Changing the brightness via FN key combination or via the brightness applet 
is very slow.
  the CPUs don't seem to go to 100%, but the adjustment process seems 
relatively slow.
  The mouse cursor is also sluggish.
  Reinstalled the OS twice, but not because of this issue and the problem seems 
to persist.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: gnome-power-manager 2.32.0-2ubuntu2.1
  ProcVersionSignature: Ubuntu 2.6.38-11.48-generic
  Uname: Linux 2.6.38-11-generic x86_64
  Architecture: amd64
  Date: Sun Sep 11 15:29:02 2011
  GnomeSessionIdleInhibited: No
  GnomeSessionInhibitors: None
  GnomeSessionSuspendInhibited: No
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
  MachineType: Dell Inc. Latitude E5410
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-11-generic 
root=UUID=0dfaacc9-c19d-425b-963d-dabb87ae18bc ro quiet splash vt.handoff=7
  SourcePackage: gnome-power-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/28/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 05C67D
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.product.name: Latitude E5410
  dmi.product.version: 0001
  dmi.sys.vendor: Dell Inc.

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