This is a simple, mergeable mod that overrides model paths and forces Weather - All Natural mod to use my, performance friendly rain and snow meshes (simple rectangle with the scrolling texture of rain or snow applied to its sides) instead of VaPER's, particle-based ones. Check the VIDEOS tab for demo.
The ESP doesn't change anything else except these paths, so it doesn't conflict with anything.
The boxes are made a little bit smaller than the original to prevent clipping through walls in some interiors.
Requires All Natural.esm as a base.
Should be merged into Bashed Patch to save a slot..

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INSTALLATION:
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The mod can be installed with any mod manager you prefer, or you can just extract the archive into your Data folder, and activate .esp in OBMM.
The mod will work from any position in your modlist, but I recommend raising it above All Natural.esp

I'm using Wrye Bash, here's how it's done there:

1. Launch Wrye Bash. Go to the Installers tab. Drag and drop downloaded archive there. Right mouse button on the archive > Install..
2. Go to the Mods tab. Make sure that "All Natural Rain&Snow Optimised Mesh.esp" lies ABOVE your Bashed Patch (You can drag'n'drop plugins with mouse, or holding CTRL + up/down arrow keys).
3. Right click on the Bashed Patch > Rebuild Patch..
4. Done.

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UNINSTALLATION:
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1. Deactivate "All Natural Rain&Snow Optimised Mesh.esp" in your mod manager.
2. (Optional) If you installed the mod manually find and delete "Palromfix" folders in the "meshes\allnatural" and "textures\allnatural" folders.

Via Wrye Bash:

1. Go to the Installers tab. Right click on the archive on the list > Uninstall.
2. Go to the Mods tab. Right click on the Bashed Patch > Rebuild Patch..
3. Done.