Please try the HPLIP driver. It should be resolved with this driver.

** Changed in: simple-scan (Ubuntu)
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/1619868

Title:
   HP Scanjet 3670 is very slow when scanning at 600-1200 dpi

Status in simple-scan package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: simple-scan

  Scanner model: HP ScanJet 3670
  Ubuntu-release: 16.04 LTS

  Relevant packages and versions:

  libsane 1.0.25+git20150528-1ubuntu2
  simple-scan 3.20.0-0ubuntu1
  xsane 0.999-3ubuntu1

  When I use Simple Scan with "scan as photo" option at higher
  resolutions, the scanning process is very slow: on 600 dpi, it takes
  5-6 minutes; on 1200 dpi it would take about an hour to scan a page
  (to be honest, I cancelled the process about halfway).

  In contrast, if I use xsane with "factory settings" + 1200 dpi, the
  whole process takes about 6 minutes.

  This has been an issue since Lucid.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: simple-scan 3.20.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
  Uname: Linux 4.4.0-34-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Sat Sep  3 10:42:53 2016
  InstallationDate: Installed on 2016-07-08 (56 days ago)
  InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  MachineType: Gigabyte Technology Co., Ltd. P41T-D3
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-34-generic 
root=UUID=5e687229-c1df-4d07-8e18-de619811a390 ro quiet splash
  SourcePackage: simple-scan
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/31/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F1
  dmi.board.name: P41T-D3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF1:bd05/31/2010:svnGigabyteTechnologyCo.,Ltd.:pnP41T-D3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP41T-D3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: P41T-D3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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