A often heard complaint from people evaluating PhotoLab for the first time is that the Preview generation creates blurry previews, while development settings are changed with the sliders in the “Customize” area. This feels like a blackout and is often perceived as bad performance. This looks like this:
Looking at the same time into the task manager, it is reveiled, that the CPU is almost sleeping, although all cores are used:
The request is to improve the preview generation architecture, so that the visible image part never becomes blurry, while dragging the development sliders. An inaccurate preview is OK, as long as the user does not zoom to 100%. At 100% the changes should be calculated on the visible image part only, which is much smaller than the screen resolution.