Water pressure differs from home to home, even on the same block in some cases. The problem of overall low water pressure is probably due to plumbing problems too complex for the average homeowner to fix. If a single kitchen faucet runs slowly, however, the problem is your faucet.
Cartridge is Clogged
Each faucet has a ceramic disc cartridge in the handle area to moderate the flow of the water and its temperature. This part has tiny holes to allow water through to the spout. Sediments and minerals, not to mention dirt and debris, can clog these holes on occasion, causing the amount of water flowing through them to drop. If only one faucet is experiencing low water pressure, be it a kitchen, bath or bar faucet, this is probably the problem. To fix it, remove the handle and cartridge, then flush the cartridge under clean water and put it back in the faucet housing.
Another common problem is a blocked aerator. This is often the issue in kitchens where the faucet is frequently used. Sediments or debris in the water clog this part just like they do the cartridge. Since the aerator, which is located at the end of the spout, has a mesh screen, particles build up on it over time. Unscrew this part and replace it with a new one. That is the fastest way to fix the problem.
Another possibility is a low-flow faucet. Some faucets have lower flow rates already built in. This is to save water and money, so for some it is a benefit. If you moved into a home and the faucet has always been flowing at a low rate, or you recently installed a new faucet and the flow is now lower, this is probably the culprit. The obvious solution is to replace the faucet with a higher-flow product.
It is possible that the low flow rate is a plumbing issue. A blockage in the pipes to the kitchen faucet causes lower flow rates. However, the possibility that a blockage occurred just in pipes to the kitchen and does not affect the other faucets is rare if not virtually impossible. Check the hoses under the sink, the ones leading to the faucet for blockages, hair or particle matter just in case.