low water pressure
What type and size is plumbing?? How much pressure at the source(where it enters the house)??
Ideally, the pressure entering the house should be about 60psi. You can get an inexpensive gauge to test this at most home/hardware stores. If you have an older house with galvanized plumbing, that can be the problem. Those pipes clog on the inside over time from rust and calcuim deposits. If copper, the usual incoming line is 3/4", it should stay that way as close to the final fixture as possible before it sizes down to 1/2 at the fixture. That is often not the case. Too often, the pipe is downsized to 1/2 shortly after entering the house, which drops the volume of water. Another thing to check...make sure all shutoff valves are full open. Cycle them off/on as a double check.