Operating system: Win 10 1909
CPU: Threadripper 3990X
Graphics card: RTX 2080 TI
Broken: 2.93A, 2.92, 2.91
Worked: 2.83 LTS all versions
Short description of error
Playing back the animation results in an excessive CPU load and very low FPS in all 2.9X versions of blender.
Even removing all meshes from the scene and having just the armature results in an extreme CPU load with very slow playback.
This issue is not present in 2.83.
Below are some screenshots I took with the tree creature file, as well as a human rig.
as you can see the CPU load is around 4% with the human rig in 2.83 and 54FPS. when opening the same in 2.9X, the CPU load is 80% with 42FPS.
This is with no keyframes set, when using a scene that has keyframes, the difference is much greater. 48FPS in 2.83 vs 11FPS in 2.9x.
Exact steps for others to reproduce the error
- Load any character with an animated armature
- hit space to play and look at frame rate and CPU load.