Like dragon lord said check the aerator. Remove it and use it normally for a few days and that will tell you if it is the aerator. Other things to check is do you have a sprayer hooked up to the sink as well? If so the diverter could be the problem. Or the pressure could just be low.

Check the aerator. Remove it and use it normally for a few days and that will tell you if it is the aerator. Another thing to check: do you have a sprayer hooked up to the sink as well? If so, the diverter could be the problem. Or the pressure could just be low.