The fact you are using lead screws ( on all axis?) is new to me. What kind of lead screw is it? It must be some special , otherwise you can't expect to print faster than 20mm/s or the like.
My lead screw z-axis on the Prusa only goes 3mm/s until it starts rattling.
My lead screw z-axis on the Prusa only goes 3mm/s until it starts rattling.