I rate my raw photos with stars or label them with flags after importing, so afterwards I filter them by 1-star or by a red flag to delete the bad ones. digiKam freezes for 1-3 seconds after I rate an image while in preview mode. If I try moving forward to the next image, then the focus box/highlight selection box or whatever its called might move to the next one, or it might remain on the current one. After a second or three the thumbnail of the image I just rated gets updated. Why? If you try quickly rating over 200 shots then these little delays become a problem. Rating a photo doesn't change the image in any way, it's just a metadata operation, so it would be nice if this change was instant. Maybe the regenerated thumbnail is the clue as to why it's slow - digiKam should not need to do that as the thumb didn't change, just the rating or label did. Reproducible: Always
No reproducible here. Please update to last 4.9.0, and if it's reproducible, please turn on digiKam debug spaces and run it on the console as explained in this page : https://www.digikam.org/contrib Gilles Caulier
Confirmed, cannot reproduce in 4.9.0.