The Big Apple has cut in half its turnaround time for DNA testing in gun cases — following a multi-million-dollar investment last year to beef up the city’s Medical Examiner’s Office, officials announced Monday.

Mayor Eric Adams set the 30-day goal last year when he announced the creation of a DNA Gun Crime Unit, adding two dozen more forensics scientists and new tech to the office of the chief medical examiner.

“I’m proud to announce that the OCME DNA Crimes Unit has achieved a 30-day or less turnaround time for tested analysis of evidence from gun crimes,” Adams said at a press conference Monday.

“New York City is now home to the fastest big city lab for testing and analyzing evidence.”

The city’s chief medical examiner, Dr. Jason Graham, said the “most significant” part of last year’s $2.5 million injection was the added staffers to help process evidence.

“We did make upgrades to our laboratory-wide systems, and we’re bringing some additional supplies and equipment, but it was primarily the people,” Graham said at the presser at the OCME in Kips Bay.

Adams touted the agency’s speedy turnaround, saying the city had hit its target in under a year, with the agency obtaining results in 28 days in May on average.

Before the new unit, the office took about 60 days to test firearms for DNA evidence.

NYPD Deputy Commissioner Edward Caban pointed out that the city has seen a 25% drop in shootings this year.

“That means roughly 170 fewer people have been shot this year compared to last year,” Caban told reporters, adding, “There was always more work to do but the momentum we are seeing is very encouraging.”

There have been 436 shootings this year as of last week, which is down from 581 over the same time last year, police data shows.

The city’s OCME has the largest DNA crime lab in North America, processing about 50,000 pieces of evidence each year.

Additional reporting by Craig McCarthy and Bernadette Hogan