The game files are shrunk using advanced algorithms like Oodle Data Compression or NTFS LZX compression . This can reduce a 100GB game to as little as 2.5GB for easier downloading.
Several classic and modern F1 titles are widely available through community archives and "repack" sites: f1 highly compressed pc game extra quality
However, if you're looking for a more premium, graphically intensive experience, you may want to consider other options. The game files are shrunk using advanced algorithms