My first thought was to ask how the pressure is in the bathroom.
Having the kitchen faucet lose pressure seems to have been a common problem over the years. Usually one of two possible causes.
There could be debris at the faucet sprayer or the "water saver" device is saving too much water.
So, I suggest that you remove the spray head and clean it. Also remove the sprayer hose from below the sink and look in the hose for a small plastic flow restricter. I would, and have on my rig, remove that flow restricter.
Peace
Dave