Collocations for efficiency - noun

ruthless | great, high
attempts to achieve greater efficiency in the production process

maximum, optimum | low | cost | energy, fuel | mental, physical | administrative, business, economic, industrial, management, operational, organizational, production, productive, technical

achieve | boost, enhance, improve, increase, maximize, promote | decrease, impair, reduce

drive, measures
New timekeeping procedures had been introduced as part of an efficiency drive.

gains, improvements, savings
the efficiency gains resulting from improved technology

with ~
The uprising was put down with ruthless efficiency.

~ in
greater efficiency in energy use