Looping FBX animation stutters/freezes at random positions. How to solve?

Unity Engine
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UPDATE: THE WHOLE UNITY EDITOR stutters for a second or so every 3-5 seconds. Even in blank projects. Looping FBX animation stutters/freezes at random positions. How to solve? - Unity Engine - Unity Discussions

A looping skeletal mesh animation from a FBX file freezes at random intervals and random positions in Unity. It’s not even related to the animation frames, because the animation loops perfectly in Blender, UE and even in Unity, the problem are the random stutters/freezes.

You can see even the playback in the Director freezing randomly:
8422953--1114605--Animation.gif

Look how it just freezes for a second then continues (this is a random position in the animation, not at the looping part):
8422953--1114611--Animation111.gif

Anyone has gone through something similar? Any idea of what this could be?

It could be my computer, but it’s a very beefy computer (as a comparison I run big UE5 projects in max Epic settings w/out frame drops).

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UPDATE: this is happening to all animations I import - Unity randomly freezes/stutters for a few frames when playing animations. I already updated the GPU drivers (using RTX 3080Ti) and I’m facing the same with 2021.3.9f1 and 2022.2.0b7.

Anyone else?

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UPDATE 2: Only in the editor. For exported builds there are no stutters and the animations loop perfectly.
It’s good, but at the same time very annoying and distracting, since it makes it harder to develop and test the game, giving false impressions that there’s something wrong all the time.

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UPDATE 3: It’s actually the WHOLE editor stuttering every 3 seconds or so - even in blank projects! And I found out this is an issue that happens since the beginning of Unity.

Example: Unity editor stuttering - Questions & Answers - Unity Discussions

Forcing to run with DX11, DX12 or Vulkan does not solve it.

Lost here.

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The editor was stuttering like crazy for everything.

Solved by checking “Use incremental GC”. :shrug:

8425647--1115211--upload_2022-9-8_17-25-25.png
8425647--1115211--upload_2022-9-8_17-25-25.png1438×886 105 KB

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EDIT: OOPS. Just read your last post… gotta learn to read the whole thread, hahaha.

I know the feeling, here are my recommendations:

  • Open up the profiler, see what goes on when it skips.

  • Check window’s task manager to see if some process monopolizing the cpu/gpu.

  • Try disabling compression when importing animations

  • Make sure you don’t have some malware running that could interfere.

  • The editor can get bloated. Do you have a ton of assets and editor tools in your project? Some tools are poorly coded and can mess up the editor’s performance.

  • Duplicate your project, remove EVERYTHING (assets, tools, comment out code) you don’t need for that single feature and retest.

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