Sluggish keyboard navigation

[jdp1024]

In Browse mode, under a folder which contains about 2000 8k-resolution pictures optimized with ImageOptim. When I use arrows keys or PageUp/PageDown in XnView MP to navigate in the file list, XNView MP responds slowly. The selection switched to the next file after 0.x seconds, not immediately.

I have turned off the Preview and all Info Panels, the file thumbnail is already generated. Each time I press the arrow key, in Task Manager, I can see a CPU usage boost, just like XNView MP is decoding the file (but I think it doesn't need to do that).

If I use keyboard navigation in a folder containing only small image files, the navigation is smooth and the CPU usage is low, but there is still a CPU usage peak.

[xnview]

i've tried and right, the delay to load this jpeg file is slower than standard jpeg. Loading in other apps is the same.

[jdp1024]

i've tried and right, the delay to load this jpeg file is slower than standard jpeg. Loading in other apps is the same.

If only the header is parsed, there should be no difference. I guess not only the header is parsed, but also the jpeg is decoded, and this should not happen if there is no need to do that since I closed all info panels.

[xnview]

oh sorry, the preview is hidden but picture file is always loaded for histogram

[jdp1024]

oh sorry, the preview is hidden but picture file is always loaded for histogram

I have closed the histogram panel (in fact, all panels are closed). Perhaps you can skip file decoding if the decoded bitmap is not needed.

[xnview]

I have closed the histogram panel (in fact, all panels are closed). Perhaps you can skip file decoding if the decoded bitmap is not needed.

so you use XnView's browser only as file's list? In this case, yes it would be good to not load image file

[jdp1024]

I have closed the histogram panel (in fact, all panels are closed). Perhaps you can skip file decoding if the decoded bitmap is not needed.

so you use XnView's browser only as file's list? In this case, yes it would be good to not load image file

Yes, I use the browser mode as a file list (a browser). When a panel is closed (or hidden, invisible), the CPU time can be saved if the data is not read/extracted/decoded.

[xnview]

ok, i'll check to change that