A "highly compressed" 200MB file will still expand to ~8GB. Ensure you have the space.
"Highly compressed" games found online can sometimes have missing content (like audio or FMVs) or, rarely, contain malware. Use reliable emulator forums and always scan files before opening.
After testing dozens of community uploads, here are the three best versions based on the "better" criteria:
Better than ran. It sprinted .
Set Internal Resolution to 2x or 3x Native for HD visuals that look better than the original PS2.