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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
    On a submarine which doesn't help much.
    IrfanView 4.50
    64-bit Win 10
    CPU Cores

    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
    East London
    64-bit Win 10
    CPU Cores


    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

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