Is this from the supply, or the drainage system?
FWIW, there are some practical limits on how fast the water should move through pipes. For hot water, 5'/second is often considered maximum for longevity with 1/2" pipe. It can be faster, up to maybe 8'/second with the cold water side and assumes copper pipe. Those are more with continuous use, but should be taken into consideration on any supply system. If the plumber didn't use proper techniques when cutting and prepping for the connections, each one of those could be causing a little turbulence...when you use a tubing cutter, it tends to mash the ends in a little...prior to soldering the pipe, you are supposed to use the tool to make that full diameter again to smooth out the water flow. Lots of elbows can slow things down.
What kind of pipe is in the house?