We had a low flow shower head and changed it to incredible flow. I had a plumber suggest a new toilet with the 1/2 on top to save water. I fired him on the spot.
For a few bucks you can buy a whole series of flow reducing inserts. Just a reduction washer.
Bought an expensive faucet from a company with the name ‘American’ in it. I could not figure out why the flow rate was so weak. Had them ship me a replacement spray head, same problem… the company is saving the planet…. So my next faucet purchase was cheap crap from China, it works perfectly, and when I crank it up I get water no woke.