Thanks for starting to update the speeds on some of the roads. I have already updated the road segments impacted by the new school zone speed limits around the city but have not done a larger update of the general speed limit on all roads. If you use a tool like JOSM (https://josm.openstreetmap.de/) it may be a easier task of updating all the roads in a selection set using filters to just get things that are residential streets etc. otherwise a manual process may be needed to make sure the correct road types are tagged correctly. I think also Schenectady lowered their speeds to 25 mph as well.