Capture Virtual Camera problem with arkit


I am a Compositor and work on nuke & autodesk flame. I just start to study unreal engine 3 month ago and want to learn in virtual production.
I follow the tutorial ( and make my first demo.

My Demo:

I use IPad Mini to be the virtual camera by arkit. Everything is fine when I just idle animation on the mannequin.(demo video in 0:00-1:10).
However, I put another animation, like run, walk & jump on the mannequin, then my computer is lag when I capture my camera.(demo video in 1:52-3:00)
I don’t know is me misunderstand something or some setting in the project I was missed.
Or can I reduce the fps and the quality of play mode just like the viewport that can display in wireframe and switch off the motion blur?

here is the link of the project:…1O?usp=sharing

Hopefully anyone can give me some advice. Thank you.