Created attachment 116535 [details] A screenshot of the problem, but I recommend watching the video I linked. SUMMARY When I open an image and grab it to move, CPU usage spikes and Gwenview becomes very slow until it finishes moving. Scrolling doesn't cause any problem. STEPS TO REPRODUCE 1. Open an image large enough; 2. Open Ksysguard to monitor cpu usage; 3. Grab the image and try to move it, like if you were trying to see the rest of it, zoom in if necessary. OBSERVED RESULT CPU usage spikes and Gwenview gets slow until it finishes moving the image around. EXPECTED RESULT Normal CPU usage. SOFTWARE/OS VERSIONS Linux/KDE Plasma: OpenSUSE Leap 15.0 KDE Plasma Version: 5.12.6 KDE Frameworks Version: 5.45.0 Qt Version: 5.9.4 ADDITIONAL INFORMATION Video here: https://www.youtube.com/watch?v=KESacDWYqKo&feature=youtu.be Hardware: Intel Core i7-4790 3.60GHz 16 Gb RAM NVIDIA GEFORCE GTX980 TI (driver 390.87) I am just using the standard repositories that came with openSUSE Leap 15 plus the community and NVIDIA ones that Yast lists by default. Desktop effects are turned on and I didn't change anything related to them.
I can confim on my system. Operating System: Arch Linux KDE Plasma Version: 5.15.1 KDE Frameworks Version: 5.55.0 Qt Version: 5.12.1 Kernel Version: 4.20.10-arch1-1-ARCH OS Type: 64-bit Processors: 2 × Intel® Celeron® CPU G1820 @ 2.70GHz Memory: 7,7 GiB of RAM
I use gwenview 18.12.2.