Ground crew

Hi,

When im standing with a plane at te gate the ground crew is doing just fine and also doing the things that i ask to do. But de figures (people) that are standing still en just walk around a bit are leaking. Its like when they move it looks like 10 fps. But other cars (also the stairs and baggage truck) or planes that are moving, are moving normal on the same time. I don’t know if its just a setting that needs to be changed…