When a file is "highly compressed," it has been run through an archiving tool (like WinRAR, 7-Zip, or ZIP) to reduce its file size beyond standard limits.

Let’s assume you found a file named God_of_War_2_USA_HR.7z that is 600MB.

You save massive space, but you lose a tiny bit of quality (usually unnoticeable on a monitor) and your CPU must work harder to decompress the game as you play.

. While useful for devices with limited storage, "highly compressed" downloads (often under 100MB) frequently come with significant trade-offs or security risks. Review: Highly Compressed PS2 ISOs Compression Efficiency : Standard lossless formats like (Compressed Hunks of Data) or (Compressed ISO) typically reduce file sizes to roughly