the Flash Vs. AMAZO, from Justice League: the Nail, Vol. 1 # 2, Written and Illustrated in Pencil by Alan Davis, with Inks by Mark Farmer, Colors by Patricia Mulvihill, Letters by Patricia Prentice, and Editing by Mike Carlin.
As I understand it, the Speedforce is essentially the governing energy source for all motion. Meaning that the Flash is (essentially) the God of Motion.
Barry is able use that energy to traverse time, dimensions, space, to bring people with him, or to reach into the brain of an Android designed to kill his entire team, and just push it out of the android’s head. An Android capable of giving the entire league a hell of a fight at the same time, and Barry beat it by himself. In Crisis on Infinite Earths, Barry destroyed the Anti-Monitor by running in a circle around him so fast that it reversed the anti-matter composition of the entity on a molecular level. Think about that.
And Wally West is even more powerful than Barry. Wally has been described as having a more direct connection to the Speed Force than Barry. Barry was given his powers by way of a lab accident. Whereas Wally was born with his, and he has gotten more powerful as he has grown into them.
Wally once used the Glimmer’s Hyper-Wheel as a treadmill to get himself up to a speed described as “Faster than Light Squared”. The Hyper-Wheel did not increase Wally’s speed, it just gave him the running room to get up to speed. Wally used that Speed to Fax himself from a world beyond the Source Wall, all the way back to Earth. And, Wally brought Aquaman and Green Lantern with him when he did it.
Here are some quick mathematical facts:
The speed of light is approximately 186,282.4 miles per second (It is approximate because of a variety of reasons, but the number serves my purposes). As a matter of comparison, the Earth’s circumference -measured along the Equator- is 24,901 miles. Traveling at the speed of light, the Flash can circle the globe on the equator 7.4809 times in the same amount of time it takes for you and I to say the word “alligator”.
7 and ½ times around the equator in one second, and that is not even his top speed.
the Flash is one of the most powerful people in the DCU, but he is just so good natured that nobody would ever think of him that way.