Speed Demon was one of the villains of The Flash. He was a supervillain who used extreme speed and had once appeared in the story of The Flash. As for the background and abilities of the Speed Demon, further information was needed to confirm it.
In certain comic universes, the Speed Force has faced significant events that could be interpreted as its 'death'. However, comic storylines are complex and can vary greatly.
The top speed of The Flash in comics varies depending on the storyline and writer's imagination. But generally, it's incredibly fast, beyond what we can easily measure.
In certain comic arcs, Barry takes actions that lead to the destruction of the Speed Force. This often has significant consequences for his powers and the superhero universe.
Barry Allen can steal speed in comics, but it's not a common or straightforward ability. It often occurs within complex storylines and with specific conditions and consequences.