Don't sound so god dam condescending all the time. You are on Narutobase after all.
First of Mach 1 is a visible speed, you can see objects moving at the speed of sound.
It is obvious in the picture that Naruto can't be seen, even by Kakashi(up for debate) who's eyes far surpass what we normal humans can see. I also want to point out the angle in which Naruto is moving, he first moves in the direction toward Kakashi, then in front of him. I think we can agree that something incoming is much easier to see than viewing something from a side angle. (btw Mach 1 speed still can be viewed from a side angle).
Now, I want you to forget what you read on wikipedia for a second, and look at this image of a sonic boom.
Now we both know that the size of a sonic is relative to the mass of an object,(excuse me if I'm slightly of with my terminology)
That being said, Naruto's sonic boom would be incredibly small, almost non existent. Just like a bullet's would.
Remember bullets can travel faster than Mach 1, I even think when your precouis sasuke shunshins he can surpass mach 1.
Maybe with all the dust and destruction, a sonic boom wouldn't be visible or maybe kishi isn't an aerospace engineer and forgot about the concept of the sonic boom.
Maybe it's a manga, and we can't hear anything, and maybe the 3 characters around didn't feel like commenting on the sound, considering that TBB's were flying in all directions.
Please stop with the science, it's a manga, logic like below doesn't really apply...
Air reacts like a fluid to supersonic objects. As objects travel through the air, the air molecules are pushed aside with great force and this forms a shock wave much like a boat creates a bow wave. The bigger and heavier the aircraft, the more air it displaces.
wether I'm wrong or not, I really don't care, now I hope you agree that maybe Saw's post wasn't so "legendary", and maybe you should stop being a pretentious *******.
edit: Right now I'm wondering if I'm not understanding your reply, I honestly don't know how you don't think Naruto was traveling at mach 1. Look, I'm not going to pretend like I know everything about sonic booms, and I guarantee there is something wrong, so don't try to avoid the main concept by attacking some details.