The phrase "a vast commitment of" is correct and usable in written English.
It can be used when discussing a significant or extensive dedication of resources, time, or effort towards a particular cause or project.
Example: "The organization made a vast commitment of resources to support the local community during the crisis."
Alternatives: "a significant investment of" or "a large dedication of".
Writing what is essentially a compilation of essays requires a vast commitment of time, reading and effort.
In 2003, ostensibly but misguidedly as part of his global war on terror, the younger Mr Bush invaded Iraq, rid the country of Saddam but then got bloodily stuck; it took a vast commitment of American troops and fresh thinking to bring the violence under control.
Acer, the world's second-largest PC maker, has already made a vast commitment to the smartphone market.
His view was that England had won the World Cup by the narrowest of margins - with a vast investment of resources, time and commitment.
"We know that his England commitments take up a vast amount of the season, but when available he has shown how he can further strengthen our batting lineup, and it's great he will be with the club for another two years".
Coordinated changes in gene expression underlie the transition from a pluripotent stem cell state through lineage commitment and differentiation into a vast array of cell types.
But what is striking about Romney's remarks is that they have replaced that commitment with a willingness to blame a vast swath of striving, middle-class Americans for their plight.
But whatever its limitations, the Pentagon's study discloses a vast amount of new informa tion about the unfolding American commitment to South Vietnam and the way in which the United States en gaged itself in that conflict.
Our entire practice takes great pride in delivering a vast array of neurological and other medical services with a commitment to excellence.
The country has fallen far short on a decade-long commitment to build the world's leading semiconductor industry, and it still imports a vast majority of microchips for the products it assembles.
There are now a vast number of education authorities under Conservative control, but they have not been clamouring for a Tory commitment to build a grammar in every town.
