The nimble is a remote direct drive extruder so it is super light like a Bowden setup. And print speed is definitely related to the weight of the moving tool head (that’s why Bowden printers can print faster then direct drive) but there are limitations set by the guide screws and steppers, flow rate and other factors. And recommended is less then 60mm/s I think the default settings (in luban and in the prepare cura configuration) is 40. But I’m sure it can be pushed past that.