Bad crudded up shutoff valves. We had a problem, that our hot water would trickle out of our kitchen faucet, due to the valve had so much crud in it, there was not enough flow. Changed out with 1/4 turn Ball valves, and plenty of water pressure.
The problem with our city water, is that they soften the water, so you get a lot of salt crud at fittings & valves, if you do not allow for full flow.
Also the odd thing is that when I took apart the shutoffs for the wash machine, I found a small pebble in the Cold water shutoff for the Wash machine, that was caught right at the valve. Lucky it did not go further to get into the valve for the wash machine.