As I said before…
I don’t need DeepPrime/XD for the preview in the editor. And I don’t think anyone else does. We are not asking for this.
What we are asking is for an accurate preview at every zoom level of ALL OTHER settings which aren’t currently applied (chromatic aberration, sharpening, purple fringing), EXCEPT for DeepPrime/XD. And that is highly feasible, and wouldn’t cause any noticeable increase of refresh times on any current PC with a CPU that’s at least decent.
All modifications except noise reduction are almost instantaneous on my 7 years old i7. They are almost instantaneous even at 75% or higher, so they would just be as instantaneous at lower zoom level.
Current implementation of the viewer applies every correction except for noise reduction at 75% or higher. It would not cost anything more in terms of performance to to the same also for 70% or lower. That’s the request, and it would be so easy to do it…
The way to do it would be to always render the image at 100%, and then RESCALE it (which is a quick and easy to do, and it is what other editors do). No reason why this rescaling can be done at 75% but not at 70% and below: just plain laziness or because they think the difference cannot be noticed. It can, and sometimes it’s a HUGE difference, as I have proven several times with images:
If one can’t see the difference, well… I would check a good optometrist. It’s visible in the 1080 screenshots, and even more visible on a 4K screen.