> That sounds counterintuitive . What about higher pressure will slow water down?

It sounds counterintuitive because it's not worded well. Imagine a garden hose with no nozzle: The water doesn't go very far, but you can fill a bucket with it pretty quickly. You can also restrict the flow by putting your thumb over the end of the hose. That increases the pressure and allows you to fill up a bucket farther away, but it takes longer because you've lowered the volume (GPM) of water flowing from the hose.

Firefighters use nozzle tips of different sizes to make trade offs between pressure and volume.