Results 1 to 2 of 2

Thread: Why is it so slow and consume a lot of CPU to pan a zoomed image?

  1. #1
    IV Beginner
    Join Date
    Oct 2012
    Location
    On a submarine which doesn't help much.
    Posts
    56
    Version
    IrfanView 4.50
    OS
    64-bit Win 10
    CPU Cores
    2

    Default Why is it so slow and consume a lot of CPU to pan a zoomed image?

    I opened a 1080p-sized picture (about 1MB in file size), zoomed it in (300%), and tried to pan the image either by using the keyboard or the mouse.

    In either case, the CPU usage soared to over 50% (on all 12 threads), the mouse pointer was flashing among the hourglass, the hand, and the regular pointers, and most importantly the panning was slow when I used the mouse wheel to pan down.

    If I do the same thing with Windows' Photos, the panning is very smooth, and it the CPU usage does not soar at all. Can this situation be improved for IrfanView? I mean, a 1080p image should not really that taxing on today's fast computers...

  2. #2
    Moderator Enterprise User Bhikkhu Pesala's Avatar
    Join Date
    May 2007
    Location
    East London
    Posts
    6,425
    OS
    64-bit Win 10
    CPU Cores
    1

    Default

    No problem here with 2450 x 3250 Pixels (7.96 MPixels) image.
    Disable resampling from the View menu, Display Option

    Specs: AMD A10-6800K, 8 Gb (WinSPRLevel = 5.9) on Win 10 64-bit 1909 build 18363.657

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •