The old cartoon character might run fast because there's a time limit to achieve a goal or to save someone. Also, it could be a way to create excitement and keep the viewers engaged.
Maybe he's not looking where he's going and is too distracted.
It could be that the cartoon cat was startled and ran without looking where it was going. Or perhaps there was a plot element that caused it to run over.
Well, it could be that Cartoon Cat runs away because it lost its way or is being chased. Maybe it's just looking for a new adventure too!
It could be that the old cartoon character is in a rush to escape a danger or reach a hidden treasure before anyone else. Sometimes, these quick sneaking actions add excitement to the story.
Maybe she's imagining it as part of a fun adventure or game.
It could be that the dog saw something interesting on the other side of the screen and wanted to get there. Or perhaps it's part of a story or game where running across the screen is a key action.
Could be that she's scared and not thinking clearly. Or perhaps she's been wrongly accused and is panicking.
Well, the speed of the Flash varies in the comics. It depends on the story and the power level he's shown at that moment. Generally, he's capable of moving so fast that time seems to stand still for him.
The speed of Flash in the comics is mind-boggling. It's not a fixed number. Sometimes he can move so fast that he seems to be everywhere at once. It all depends on how the writers want to showcase his amazing speed powers in each specific story.
Maybe she's looking for a partner to share her life and have fun together.