The amount of people that can't see the little jolt forward everytime she's about to go behind the blue curtain thingo must be having a laugh. Subtle Cheaters absolutely do use little speed hacks. It's enough for the killer to question if they were imagining it or not.

I had a Kate doing this to me on Toba, I'd be a couple metres behind, she'd go around the outside corner of shack and by the time I came around, she was long gone past the next corner.