I don’t really care about this verse, but since CW Flash is mentioned so often, I’ll touch on it.
It has been claimed that the statements regarding Flash’s speed are consistent, but this is incorrect. These Mach statements contradict each other, and they also contradict the FTL statements introduced starting in Season 2. Furthermore, the CW writers contradict themselves. They say a weapon’s maximum temperature is the Planck temperature, but in the next episode, they say that weapon’s maximum temperature is only a few thousand degrees. They say Barry runs at Mach 7 while circling the Earth in real time in one second. They say a billion joules is a megaton, They say Flash can throw punches faster than light, but then they say he moves at 20 Mach. and so on. In one episode, they say he needs to travel at Mach 2 for time travel, but in another, they say he needs to go faster than light; they say speedsters can perceive and move in nanoseconds, they claim microseconds are painfully slow for speedster—but they’re not even at Mach 5 according to statments. So even if you try to follow statements, you can’t arrive at a consistent conclusion because the statements aren’t consistent with each other.
It also contradicts every scene shown. For example, in the very first season, Barry sees a real lightning bolt in slowmotion, but its speed is under Mach 2; he sees dozens of bullets as if they were motionless and changes their paths, but according to the statements, he’s moving at the same speed as them; he sees a lightning bolt as if it were motionless and outpaces it, but he’s not even traveling at Mach 10; they outpace cameras with trillions of frames per second but aren’t even at 50 Mach, Flash can traverse a corridor in 3 picoseconds but isn’t even at 20 Mach, and he watches a nuclear bomb’s reaction freeze for an entire episode while traversing city blocks but isn’t even at 20 Mach. He can travel from the U.S. to China and back before a camera completes a single rotation, but he’s not even 20 Mach.
So the situations with DB and CW aren’t exactly the same; they might seem similar at first, but they’re not.