Editing low-res proxy, then applying changes to high-res

Hello
I'm developing one continuous image for a large wall that will be seen from about 1-2 feet viewing distance. It has to be about 100 dpi.
My image is currently 21,600 x 8100 pixels at 8 bits CMYK. It may get bigger. I don't have to do much manipulation, but a lot of it is using brushes and the smudge tool.
2 issues:
1) I have a 12-core Mac Pro with 24GB RAM. The smudge tool is sloooooow when working on this image (like one smudge at max brush size takes 15-20 seconds to take effect).
2) IS there a "warp mesh" tool that I can use in place of the smudge tool?
Is there a way for me to edit a lower-resolution version of this image, then apply the changes I made to the high-res version? then I can use the smudge and brush tools and finessé my work without the machine bogging down, and the imagery will look correct. I'm looking for a way to use these tools more in real time while working with this big image.

This appears to be the solution (at least, it is for me). I can apply my changes to the low-resolution proxy by saving the mesh and then applying that same mesh to the high-resolution image. The large brush sizes (in comparison to the image resolution) that I am afforded in the low-res version are brought across to the high-res because the changes are not applied as brush strokes, but rather as alterations to an overall mesh. the changes to the mesh are what is transferred when I export and import.
Applying the mesh is pretty slow, and it requires a few tweaks at the high-res level, but it gets me 95% of the way there. I think this is workable.
To recap - here are the steps:
1) I make a low-resolution version of the image (like 1200px wide)
2) I make my edits to the image using Liquify
3) before committing the Liquify changes, I "Save Mesh" in the Liquify tool
4) I open my high-resolution image
5) I use liquify, but I do not use any brushes, but in stead load my saved mesh from the low-res
6) profit.
thanks for the help folks!
--------------S

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--------------S

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Message was edited by:
John @ RBoS

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