It might help, but you'd need to know what kind of supply volume you have and the pressure available. If everything is plumbed with say 1/2" (like my mother's house from the curb), you are restricted in your supply, and fixing that may be required to fix things. Is there any old galvanized piping in the house or used at one of the valves (say at the tub?)? That can close up with rust and give you the equivalent of less than a soda straw for volume.
A little more info on what you have might allow a better answer whether it might help.