When developers release a game, the data (textures, audio, 3D models) is usually "uncompressed" or lightly compressed for fast reading by your hard drive. Highly compressed versions of Skyrim use algorithms like , 7-Zip , or Ultra Compression (UC) to shrink these files into a much smaller package.
Look for "Insignificant Object Remover" or "Low Res Textures" on Nexus Mods. Original (Legendary Edition) Special Edition What are your (RAM and Graphics Card)? Do you plan on adding heavy mods , or do you want a vanilla experience download top the elder scrolls v skyrim highly compressed