The phrase "immense speed" is correct and usable in written English.
It is used to describe something that moves very quickly. For example, you could say: "The hare ran across the field with immense speed."
He is like several broken telegraph posts and swims at immense speed.
The writer/artist Franci Manapul has put a lot of thought into showing off the hero's immense speed.
Drake flashed immense speed and great instincts in weaving laterally through the defense before sprinting down the right sideline.
The narrative may be advanced with immense speed and economy simply by the omission, or ellipsis, of what is not essential.
No other woman possesses her immense speed, however, and when Jones landed with a sandy jolt she was 24 feet from the takeoff board.
But the uranium fragments rubbed against resting metal at immense speed, due to the multiplication by the immense value of c2 (the square of the speed of light).
The trains would thus encounter no drag, and be able to reach immense speeds.
Pulsars, a subset of these dead stars, spin at immense speeds and have powerful magnetic fields that accelerate nearby electrons, lashing them into beams of electromagnetic radiation.
Even minuscule specks of debris can cause serious damage to spacecraft and satellites because of the immense speeds at which they travel.
The FIA decided it was safe enough to drive metal machines around at immense speeds.
It's a feeling that can be terrifying if unexpected, but when controlled and channeled, it's an indescribable rush of immense power, speed and breathless exhilaration.
