Suggested Speeds for Overhead Cranes, Hoists and Trolleys
As a child of the 60's, I remember the old phrase "speed kills." It was double entendre (I don't think I've ever used that word before). In other words, it's a phrase that has two meanings. To the average "man on the street," it's reference was to high speed driving, but the the drug culture it meant amphetamines.
Well in the much smaller world of cranes, it's meaning is simple. Moving heavy things too fast is dangerous to equipment and potentially deadly to people.
Below I have copied a page out of the CMAA Spec 70, 2004 edition regarding suggested overhead crane speeds. These are only suggest speeds for normal conditions and if you have a special circumstance, you should adjust accordingly.