The phrase "are only quickening" is grammatically correct and can be used in written English.
It can be used in contexts where you want to express that something is merely accelerating or intensifying.
Example: "The changes in the environment are only quickening the pace of climate change."
Alternatives: "are merely accelerating" or "are just intensifying".
The pace is mostly languorous, despite the jazz theme, and even when the going gets going, steps are only slightly quickened.
These trends are only likely to quicken as globalisation deepens and competition from emerging markets becomes stronger.
One of the reasons Augusta National officials are loath to see their Masters field inch toward 100 players is because there are only so many hours of daylight, and the pace of play has shown no signs of quickening.
However the merger dance with the banks and brokerage houses plays out, the pace of evolution within the insurance business is only going to quicken.
A Senate Democratic aide also points out that while Republicans may tout the speed with which certain nominees are being confirmed this year, the pace only quickened after the Senate worked through the backlog of nominees caused by GOP hold-ups over the past few years.
It was only the sight and sound of animals, in particular a sign 'Beware of bull', which quickened my pulse.
This is description at its most purposeful and it quickens the pulse: He could remember when he was good and it had been only three years before.
It is only now establishing the R&D foundation that the U.S., Japan and Europe built years ago, but globalization will help it quicken the process.
That he was repeatedly jailed and beaten for his opposition only quickened his route to becoming a modern African folk hero.
Problems associated with drought and desertification were already underway in China; a process that has only quickened in the early 21st century.
