If you've got Photoshop, you can make an "action" that halves the texture sizes for each file in a folder. This is what I have done to get workable texture sizes: - made a subfolder in the texture folder, renamed it to LoRes; - ran the action as a batch on the texture folder, specifying the LoRes folder as the output folder and adding _LO to the filenames; - copied the MAT pose folder, renamed it to [product name]_LO; - ran all .pz2 files in the _LO MAT pose folder through a text editor with decent search/replace over multiple files (I use Textpad, but there are many editors that'll do the job), replacing the filename by [filename]_LO; - and ran CorrectReferencePro to fix up the folder references. Could probably be done in the text editor too, but I was too lazy to work out the required regular expression... Not a one-click solution, but much better than resizing every texture by hand. And it has the advantage of keeping the original hires textures, and those are useful for closeups.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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