Facial animation lag during rendering in Blender

[anatolymonter]

Hi everyone!

I’m trying to render a Metahuman animation in Blender. I imported the facial animation from UE into Blender, and it plays back correctly in the viewport. But I ran into a problem during rendering — the facial animation jerks, freezes, and plays at an unstable frame rate. This isn’t specific to any renderer — the result is the same in Eevee, Cycles and Workbench. The result is unstable, freezes, and lags at different moments, even if I render it twice without changing the animation. The body animation works fine.

What could be the issue? Perhaps you could offer some advice on how to work effectively with Metahumans and render them in Blender?

[chiefmasterR]

bake the animation

[anatolymonter]

bake the animation

The animation baking isn't working right. After baking, other bugs appear, especially with the eyebrows and pupils, like this one:

Laggs.mp4

[jack-yao91]

@anatolymonter is the animation you posted, being evaluated live? Or is this the result of a baked animation with auto evaluation on the rig instance off? Can you show the results of running a baked of your animation like shown here?
https://youtu.be/j59ftPt7MUY?si=jRp0R_LI22_ZhcC4&t=400

Thanks!