Huh. Very interesting topic. I once posted a theory I developed on another forum. Here it is.
"Here's something else I'm sure most of you know.
Objects moving at extreme speed and/or with extremely high amounts of energy (related, since high speeds require high energy) warp time around them, in fact, the slow it.
o_O
I think you know where I'm going with this.
This may also help explain why fights in DBZ appear to occur at the same rate (or why the spectators can make ANYTHING out during the Cell games, while they had an equal amount of trouble during the DB tournaments), while outside the the time warp, time is slowed for the fighters, (While it may seem fast, speaking volumes for their sheer velocity), inside the time-warp, time moves at what seems normal, and the weaker being is overcome by the time/space shift that they can't keep up with the opponent.
Basically, what I'm saying is, with the stupendous amount of energy Gotenks was putting out, with the resulting almost complete halt of time (and the trail of energy he was leaving would slow time behind him), to appear to be moving that fast, he would have been moving FAR beyond the speed of light (which, according to the results of an experiment performed by 2 german scientists, is not as impossible as one would think).
And this is not limited to Gotenks, in reality, the energy attacks should be traveling as fast as light particles, so, at least in terms of reflexes, that dub line about Raditz may not have been so ridiculous (especially since the energy from the Makankosappo should have slowed Raditz, but he was already around that level, which may have been what surprised Piccolo...
So discuss, and tell me what you think."