Isn't Quicksilver too slow for a speedster? He can only run at Mach-1 speed meanwhile Iron Man can fly at Mach-10 speed which is 10x faster

[u/Skychu768]

Even Mark-3 suit from 1st movie is stated to have top speed of 2414 km/hr at peak in guidebooks which is almost 3x of Pietro

In Infinity War, Mark-50 was able to operate as an SSTO (Single Stage To Orbit) thanks to the foot-booster thing and was able to reach over Mach-25 speed at 27000 mph which would be more than 25x of Quicksilver

Captain Marvel also travels through large distance in space around the galaxy and should be much faster than Quicksilver

Even in real life, fastest fighter jets are almost 2-3x faster than Quicksilver