Originally posted by Soujaboy
There's not many, but here are a few.n Thor -#393- it’s established that Thor's speed transcends both time and space. Also, Thor could appear anywhere across the Universe or other dimensions in just seconds (FF#339, and Thor#166). In addition, Thor could, visually, detect objects that move at fantastic speeds and In Avengers-#281- Thor was able to keep track of the god of speed Hermes. However, it’s impossible to measure his speed based on those depictions. However, in Marvel Team-up#26, it gives a slight more accurate description on Thor’s Super-Human speed, and you could make a similar case in Invaders-#33, where Thor deflected artillery bullets fired at him by moving his entire left arm at super human speed. Specifically, in Marvel Team Up-#26, the writer makes it fundamentally clear that Thor can move faster than the mortal eyes can follow, and in Thor-#354, Thor was toying with Hela using speed that according to her was beyond comprehension. Thor stated that he was swift as the very lightning itself. The High Evolutionary using Thor’s DNA, created a real Super Speed character in Zefra.
thor saying that he is as swift as lightning is very likely to be hyperbole, also thor is known for being arrogant.
even if he can react that fast, supermans speed makes lightning appear slow
http://img244.imageshack.us/my.php?image=supermanvol2039p20jv9.jpg