[Bug 18647] New: gthumb very slow with 1000+ tiff fax files

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Sun Oct 30 00:11:05 UTC 2005

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Ubuntu | gthumb

           Summary: gthumb very slow with 1000+ tiff fax files
           Product: Ubuntu
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gthumb
        AssignedTo: daniel.holbach at ubuntu.com
        ReportedBy: jdorsman2004 at hotmail.com
         QAContact: desktop-bugs at lists.ubuntu.com

gthumb is working with jpg files, but there is a problem with tiff fax files.

I have a folder with more than 1000 files with FAX 4 encoding (so only black and
white), the files are small (about 50kb), but since they are scans of A4 sheets
at 600 DPI, the pictures are about 5000 x 6900 pixels.

gthumb cannot normally be used to 'walk' through these files in picture view
mode (using 'space' and 'backspace'), because the RAM memory usage goes up to
97% and de processor is most of the time 100% busy, doing a lot of HardDisk I/O.

Starting gthumb to show the thumbnails: memory goes from 75MB to 83MB, that's okay.
Either scrolling through the thumbnails or viewing the first picture: RAM memory
goes from 83MB to 449MB, that's a lot. Viewing 20 more pictures will increase
the swap usage beyond 1GB.

OS: Ubuntu 5.10
gthumb: 2.6.5  (thumbs: 64x64, zoom: low quality)
CPU: K7, with 512MB
kernel: K7

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