By/in leaps and bounds
Definition 1 of 1
Pro Tip 1/3Positive Connotation
Used to express significant improvements or progress in a positive aspect. 
Since starting the new training program, the athletes' performance has increased by leaps and bounds.
Pro Tip 2/3Metaphorical Use
It's a metaphor suggesting giant, vigorous leaps, rather than literal jumping. 
The technology in smartphones is advancing by leaps and bounds yearly.
Pro Tip 3/3Informal Expression
Common in casual conversation or informal writing, but not formal documents. 
Their small business has grown by leaps and bounds this quarter.