With this the child is almost not moving, so I changed it to
this.child.translateLocal(0, ((1000) * (1/60)) * dt, 0);
but I get the same issue on my laptop (120hz), so it doesn’t change anything.
On my mobile (60hz) I see the problem once in a while, but only with a very high speed.
Try this version where I fixed the mistake in the code I previously posted: https://playcanvas.com/editor/scene/1299499
Also, can you try putting your screen to 60hz and see if that gives you different results?
Same problem.
As far as I know I can’t change it, at least not with the setting below.
I thought it was 120hz but that’s not true, sorry about that. It should probably be 144hz.