I don't know what image size you dealing with but a 1920x1600 wide screen only has 3.072 G pixels so if all those ultra highres texture maps are on bodies under shirts/coats vest cloak whatever  bend foliage or props. All those overlapping polys are one thing but loading all the pixel scaled maps is really  stress testing  a rig try this test render a scene with no maps then art program sample the image to get some idea how big in pixels that element of your scene is. Now proportion your textures (pixel sizes) resave HR textures to new adjacent folders and resize the saved file not the originals
Streamlining your map sizes saves a lot of resourses

A word is not the same with one writer as with another. One tears it from his guts. The other pulls it out of his overcoat pocket
Charles Péguy

 Heat and animosity, contest and conflict, may sharpen the wits, although they rarely do;they never strengthen the understanding, clear the perspicacity, guide the judgment, or improve the heart
Walter Savage Landor

So is that TTFN or TANSTAAFL?