When flowing through a pipe, water loses pressure proportional to how fast it is flowing (plus other factors). If you have a shower head that keeps a large diameter until small holes at the end, the water pressure is close to your main line, and the water comes out fast. If your holes are bigger, then water flowed faster getting to your shower, so it loses pressure. If the holes at the end are longer (as in, the water flows a longer distance while in the holes), the water loses pressure there. If your shower head has internal buildup, that causes pressure loss.
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