Did you check/remove areator. look inside of valve body,take faucet apart, and place a bucket or similar device over faucet,w/some towel's around and flush the faucet out,first the hot, then the cold make sure you get full flow,just turn water on for acouple of second's etc. also look over cartridge,check for defect's

Remove the device from faucet and look into it for a small screen is it clean.