The phrase "a vastly more efficient" is correct and usable in written English.
It can be used when comparing the efficiency of two or more things, emphasizing a significant improvement in efficiency.
Example: "The new software is a vastly more efficient solution for managing our data compared to the old system."
Alternatives: "significantly more efficient" or "far more efficient".
Wal-Mart successfully beat small town merchants because they created a vastly more efficient warehousing, ordering and inventory carrying system, driven largely by a superior computing infrastructure.
Yet it is by far the most successful of all United States airlines, because it has created a vastly more efficient organization than its competitors have.
For social significance and political sensitivity, it is dwarfed by Connecting for Health (CFH), a planned information-technology revolution in the National Health Service.Supporters regard it as the secret to a vastly more efficient NHS.
He noted that automakers, driven by government fuel efficiency mandates in the United States and China, or high fuel prices in Europe, are building a vastly more efficient fleet of cars and light trucks than in the past.
However, he said that the committee's authors believed that agile radio technologies that make it possible for computerized radio systems to share spectrum on a vastly more efficient basis would make it possible to move from an era of scarcity to one of abundance.
A method is given for identifying these observation sets based on the concept of treatment separation, which is a natural approach to the problem and provides a vastly more efficient computational procedure than a standard search routine for rank reducing observation sets.
Given the fact that natural gas, though a fossil fuel, is vastly more efficient and cleaner burning than coal or petroleum based products, this is a glaring and inexcusable omission explained only by the malign power of vested industrial and political interests.
Google's system of search-specific ads is a marketer's dream, providing vastly more efficient advertising, for all kinds of businesses, than old-fashioned print or broadcast ads ever delivered.
Noticing that most cars had only a driver inside, he reasoned that a small three-wheel car would be vastly more efficient for transporting one or two people.
As time went on, it took Yeager longer to get outside to relieve himself and it was vastly more efficient to wash a few short rugs he'd dribbled or streamed on.
Spending time up front analyzing data from consumers, adjacencies and industry cross-sections may seem resource-intensive, but it's vastly more efficient than having to rebuild a strategy or re-execute a creative campaign after it's failed.
