Court delays have also been eased by a falling crime rate, which has been trending downwards over 10 years.
In Auckland, the average age of a criminal case had fallen by 21 per cent, or 33 days. The time that a jury trial remained active fell by nearly 7 per cent to 430 days.
However, the length of time that it took to clear civil and family cases had increased in most Auckland courts. In Pukekohe, the average age of civil cases had increased by nearly 20 per cent since the changes began.
Labour's justice spokesman Andrew Little said that lawyers were telling him Family Court reforms which came into force last year had contributed to greater delays. He also said that the number of people representing themselves in court had increased, and this had made delays worse.
When the Criminal Procedure Act was passed, it was estimated that the changes would reduce the time it took to resolve a court cases by six to nine weeks.
Some of the changes were controversial. Restricting jury trials to offences with maximum penalties of two years or more was criticised for limiting people's rights to justice. The threshold for electing a jury was previously three months.
Mr Borrows said today that he had focused his attention on making the system work faster, "without compromising a just outcome".
Other changes included reducing the number of pre-trial court appearances and allowing people to plead guilty or be sentenced without appearing in court.
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Average age of court cases
-Criminal jury trials
Northern Auckland (Auckland Central, North Shore, Waitakere): 430 days (-6.7 per cent since April 2013)
Southern Auckland (Manukau, Pukekohe, Papakura): 384 days (-12.2 per cent)
-All criminal cases
Northern Auckland: 136 days (-17.8 per cent)
Southern Auckland: 100 days (-27.1 per cent)
-Civil cases
Northern Auckland: 254 days (+0.3 per cent)
Southern Auckland: 200 days (+6.3 per cent)
-Disputes Tribunal
Northern Auckland: 71 days (-16 per cent)
Southern Auckland: 62 days (-27.4 per cent)
-Family cases
Northern Auckland: 309 days (+3.6 per cent per cent)
Southern Auckland: 285 days (-0.5 per cent)