Low water pressure in new house

Hi folks,
Bought a brand new house last year and the low water pressure is really getting to me. Here's some observations, any ideas for me?
- Input is city water - Gas hot water tank in the basement - Pressure in the sinks seems fine - Sinks seem fine - Showers on 2nd floor (basement + 2) have very low pressure - Water temp in main floor sinks is good - Water temp in 3rd floor showers is poor - Can't get the bath water hot, run out of hot water before tub is full
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