I agree with you, still possible sediment in cartridge or cartridge is failing.
Have you shut off the supply and taken off the supply lines from faucet (both hot&cold) hold in bucket one at a time turn supply on and verify good water pressure present? If good pressure, problem is faucet itself or cartridge.
What brand of faucet and how old is it? If its a name brand like moen, delta etc. they have lifetime warantees and possibly send you parts you need at no charge.
Have you shut off the supply and taken off the supply lines from faucet (both hot&cold) hold in bucket one at a time turn supply on and verify good water pressure present? If good pressure, problem is faucet itself or cartridge.
What brand of faucet and how old is it? If its a name brand like moen, delta etc. they have lifetime warantees and possibly send you parts you need at no charge.