SUMMARY The cube runs neatly once it's fully loaded, but if the Skybox image is decode-heavy and has a huge resolution, every time the cube is opened the skybox has to decode and load the picture all over again and again. This can be solved by caching the Skybox through the entire KWin lifetime. STEPS TO REPRODUCE 1. Use a big skybox (6k+) 2. You'll see that it takes a long time to decode and load, causing an insane delay OBSERVED RESULT The cube takes too long to load because it doesn't have the ability to cache its skybox through the entire KWin lifetime EXPECTED RESULT The Cube effect should be able to cache its skybox so it doesn't get destroyed every single time SOFTWARE/OS VERSIONS Windows: macOS: (available in the Info Center app, or by running `kinfo` in a terminal window) Linux/KDE Plasma: Arch Linux KDE Plasma Version: Git Master KDE Frameworks Version: Git Master Qt Version: Git Master ADDITIONAL INFORMATION