The PS3’s Cell processor had a unique architecture (1 PPE + 6 SPEs). MGS4 used every SPE for real-time lighting, AI, and Kojima’s infamous "cell-shaded" depth of field. RPCS3 has to translate SPE instructions to x86 code on the fly, which is incredibly demanding.
: Sites like PSNDL may host .pkg files sourced from Sony's servers, which typically require a corresponding .rap license file to function. Metal Gear Solid 4 Pkg Download
(which added Trophy support and full-game install) are also distributed as PKGs. Common Use Cases PS3 Custom Firmware (CFW/HEN): The PS3’s Cell processor had a unique architecture
MGSV PS3 - Digital vs Physical performance : r/metalgearsolid : Sites like PSNDL may host
Sony’s PS4 and PS5 do not natively support PS3 PKG files. MGS4 is only available on PS3 or through Sony’s cloud streaming (PlayStation Plus Premium). Searching for a "PS4 PKG" of MGS4 is a certain way to find a virus.