This is the most critical question.
Look for a .chd file – it’s highly compressed but playable directly without extracting a full ISO. God Of War 1 Ps2 Iso Highly Compressed
Running a highly compressed ISO saves storage space but does NOT automatically improve performance. Use these tweaks: This is the most critical question
Your compressed ISO is likely a bad rip. Find a "Redump verified" ISO instead. Redump ensures a 1:1 copy of the original disc. God Of War 1 Ps2 Iso Highly Compressed