Navigate to (EngineInstallPath)\Engine\Config\ConsoleVariables.ini
open and on a new line enter:
r.MipMapLODBias=5
save and close, launch the editor.
This will execute the command every time you open the editor, the command tells UE4/5 to use a lower MipMap. Because its a bias, it will lower any texture by 5 MipMaps regardless of its size, 8K will go to 512, 2k to 64 etc, you can choose a different number to go up or down sizes.
To return to normal, just run the command in editor r.MipMapLODBias -1 or other numbers to view other bias, max is 14.
Do note the difference between the .ini vs the in-editor commands, ini uses an = sign, in editor uses a space.
As for unchanged saves affecting video ram, it has to keep those changes somewhere, and textures are stored in VRAM. If your base game has say 3.7GB VRAM usage needed, and you change 300mb+ worth of data, it will crash.
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