id's John Carmack's told Edge that the Xbox 360 and PC versions of Rage currently have higher framerates than the PS3 version.
Apparently the Xbox 360 SKU - which uses id's new Tech 5 engine - matches the 60fps framerate of the PC version, while PS3 runs at just "20-30fps".
More on CVG.
Update: Edge has put up a story containing more quotes from the mag. Basically, the PS3 version's lagging behind, but it'll all be OK in the end. Phew.
“Everything is designed as a 60 hertz game. We expect this to be 60 hertz on every supported platform," Carmack said.
“The work remaining is getting it locked so there’s never a dropped frame or a tear, but we’re confident that we’re going to get that.”