'to improve quickly' is correct and usable in written English
You can use it when referring to something that is getting better in a short amount of time. For example, "The student worked hard and was able to improve quickly in math."
"We have to be honest with ourselves, we have to improve quickly," Demichelis said.
An initial $15m from the MCC allowed it to improve quickly.
"The academy is unable to improve quickly enough because there are insufficient leaders and permanent teachers working in the academy.
Additional practices would probably not make the Panthers contenders, but their ability to improve quickly has almost certainly been compromised.
The latest show of support from the hierarchy is understood to have been accompanied by a message that results need to improve quickly.
The hitting surface doubled in size in some cases, allowing pros more mobility and recreational players a chance to improve quickly.
As in our case, treated vitamin B12 and iron deficient infants tend to improve rapidly: hematological values quickly return to normal, and the neurological signs progressively decrease.
Of US-English quick-search results, he adds: "The quality of the US search results will be satisfying at the start and with the help of Human Web quickly will improve quickly to reach the same level as in German".
But I found no mitigation for my pain in the movie, which portrays the team as an upstart group of runners who start out losing races but improve quickly to win the state championship.
Producers had held out hope that Mr. Jones's health might improve quickly enough to allow the show to remain open, but yesterday his doctors recommended that he stay off his feet until August.
"It is clear from the result we need to improve a lot and improve quickly," added former Southampton boss Potchettino.
