I hear what you guys are saying. All I know however is I've seen it in other applications, so, clearly it is possible. Surely there would be a way to apply it to a preview image and use the preview image as cache instead of having to re-render all the calculations every time from the raw to display the liquify. As a matter of fact, I would venture and say I don't understand why Healing Brush is still slow in 2019 and why they haven't figured out yet a workaround involving preview images. For instance, here's a solution I'm thinking off the top of my head: If Liquify would be too intensive on the current Raw rendering architecture, then they could add the tool as a "LAST EDIT TOOL". Meaning, once all your calibrations are done with LR Tools, then you could use the Liquify Tool. Once you start using it, the tool would be applied on a preview image of the rendered raw. That preview is already rendered, since we already see an image with our tool modifications. So basically, as soon as you start using the Liquify Tool, LR could create a VIRTUAL COPY of your image on which we apply the Liquify. At least it would save us all the time it takes to render the raw to TIF towards PS, then opening the Liquify tool, then saving back. That's just an idea of a possibility. I'm sure there would be other ways to include Liquify in a streamlined fashion in LR.
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