Castlevania Lords of Shadow producer David Cox has confirmed that the game runs perfectly well at 30 fps - and that there's no difference between PS3 and Xbox 360 versions.
Cox said over Twitter:
"The games are identical. The 360 review code had some issues with frame rates but not major and they are not in the final [product]."
He added: "The game runs at 30 fps consistently. Occasionally that may drop but as most reviewers say it doesn't spoil the game."
Indeed, most reviews haven't been fazed by any drop in frame rate.