This is the 451st most frequent Croatian word.
znatno
Significantly.
In this case, 'znatno' describes the considerable amount of progress made on the project.
Projekt je napredovao znatno od početka godine.
The project has progressed considerably since the beginning of the year.
Here, 'znatno' is used to emphasize the significant degree of difference in speed between two objects, the cars.
Ovaj auto je znatno brži od starog.
This car is significantly faster than the old one.
Here, 'znatno' underscores the unexpected and remarkable increase in costs.