They cut the PVC tubing to length at the factory with hacksaws and in the past they have done a poor job of cleaning the filings out before gluing up the joints - leading to water pump failures and clogged faucets... They seem to have gotten a handle on that problem - but maybe a new employee on your boat...
Is the flow slow with the aerator removed from the galley spout? I had to ditch my aerator because of poor flow... WM will have aerator parts if that turns out to be the problem...
Is the flow slow for both cold and hot? Should be the same... If not, that raises other possibilities... I'm going to assume it is the same, for the time being...
If it remains slow with the aerator removed then there are likely to be PVC filings piled up either inside the faucet valve itself or at the tee-off from the main line going to the head/shower...
Take the galley faucet valve apart and clean it out would be the next step...
Failing that for a cure, would be to open the valves at both sinks - galley/head,(remove the aerators) - and blow out the lines from the galley end - i.e. backwards for the galley faucet - then turn the water on and flush both faucets... First set the faucets for cold water (both) and blow that out...
Then reset the faucets for the hot side and blow it...
Ah yes, the joy of owning a boat...