Raster images (only) causing Dolphin to freeze for few seconds (Info panel related)

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I noticed something odd that is suddenly a problem for me when selecting specifically image files (or hovering them for long enough for the info panel to update) with the information panel opened (F11) - only with raster images (PNG, BMP, JPG, WEBP, etc)

I know that it is not related to generating thumbnail previews as other formats with such previews like SVG, MP4s, blender files and audio files don’t have this problem. Turning off previews on the information panel does not “fix” this, but closing the info panel altogether does, which is why I believe it is related to the issue.

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Please share your kinfo result. How slow is the drive you are testing with ? Is it a network filesystem or an HDD ?

I am guessing this is worse with bigger images.

That might show that the issue is just reading the file. The information panel will read the file to extract metadata from images.

The image reading shouldn’t ever block the UI due to the image being generated out of process, by a separate kioworker thumbnail process.

So I suspect that’s more due to the underlying fs, and a simple stat or “read” metadata to be very slow. This should be out-of-process too though.

Audio files, mp4 could/should have the same issue.

Or maybe your are using a ubuntu based distro and hitting Kioslave 5 closed unexpectedly - #20 by inv-er5kar

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i am on kubuntu, yes. oddly enough, not too long after making this thread, the issue seemingly “fixed” itself. i will take a look at the thread you linked and see if that’s the case, if the issue is ever to return.