SUMMARY STEPS TO REPRODUCE 1. Open directory in dolphin, containing a lot of data (files and/or folders) 2. Start scrolling up and down using touchpad ot mouse wheel or whatever 3. Scrolling in directories is sluggish and laggy OBSERVED RESULT Laggy and sluggish scrolling after opening a directory after latest update. If "Size" column is enabled it seems like it is refreshing files and folders content and size and when it is over scrolling become smoother. EXPECTED RESULT Smooth scrolling. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: 5.20 (available in About System) KDE Plasma Version: 5.20.5 KDE Frameworks Version: 5.78.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION