Low pressure at kitchen sink

After replacing our sink and faucet, we immediately noticed a significant drop in output. The installer said everything was done to specs. The filter/screen inside the faucet is clean as a 1 piece unit. Other outlets to our 2-story, 4 BR colonial home are "OK" but rarely are we concerned about it coming out too hard or fast.

From our basement, the well water pressure guage is reading 45 psi.
A new water softner was installed, months after the remodeling.
Could sediment from the hard water have clogged the 1/2" and 3/4" lines that ran thru the house for 25 years without a softner?

We'd like to have enough pressure at the sink to at least blast off the dishes before washing them. Right now it's hard to even get significant bubbles with the detergent.

Thanks to all for you input and wisdom.

Sometimes, when you turn off the water to do a job, crud can work its way loose and block things up. That's why the faucet screen (aerator) should always be removed prior to turning the water back on. If you've taken off the aerator and there's no crud, then you'll have to remove the valve stem(s) and see if any crud, minerals, small stones, etc. are blocking things up.

Other possibilities are: Your shutoff valves are not open all the way under the sink. These valves could also be the source of the blockage, but that is less likely. Your supply lines may be "pinched" and not letting enough water go through.

If you didn't have this problem before, then it must be related to your new faucet.

Galvanized pipes do corrode and will cut flow over time, but this would not just suddenly become apparent and would not affect just one outlet. As suggested, check for crud in the valves.