>>714801556 (OP)I've only played the PS3 version of Shadow of the Colossus.
The PS3 version runs noticeably better in RPCS3 than the PS2 version does in PCSX2. Which isn't to say PCSX2 is bad (it's improved considerably over the past few years), it's just that the original game ran like complete dog ass on the actual PS2 as well. You can overclock the cycle rate in the emulator to get less slowdown, but that's still inconsistent compared to the PS3 version's more stable framerates.
ICO ran perfectly on PCSX2 from what I recall though, even on my shitty old i5-750 computer