Currently, as of DCS build 2.5.6.60645 Open Beta, we get two options for selecting our texture preferences in graphics menu:-
1. Texture - The setting which affects the textures of arcrafts and spawnable units.
2. Terrain textures - The setting that affects the textures of the terrain.
My suggestion is to divide the settings further into the following categories so that people can fine tune their settings to get the optimal performance/quality balance according to their system:-
1. Aircraft Textures - Textures of your, other player's and AI aircraft.
2. Ground Unit Textures - Textures of ground units and other spawnable units like ships and aircraft carriers
(If 1 and 2 aren't possible, they can be grouped together in a Spawnable Unit category)
3. Airfield Textures - Textures of the airfield including the tarmac surfaces, runways, taxiways, buildings, static objects, etc.
4. Terrain Textures - Textures of the ground APART from the airfield.
I believe precious memory could be saved by doing this as people can just turn down the textures they don't want to look pretty and keep high the ones they do.
For example, I would keep everything except terrain textures to high as I want the airfield that I'm at/taking off from/landing at to look nice, but I don't care how the ground beneath the grass looks, it could be low texture.