Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.20
Broken: version: 2.83 (sub 0), branch: master, commit date: 2020-01-14 20:45, hash: rB1ec08999b6a2
Short description of error
The way it has been explained by Pablo, this brush isn't supposed to be used on high poly sculpts because of performance issues. That I understand. However, at the moment Blender begins to freeze and slow down heavily by just selecting the IK Pose brush with segments and/or smooth interactions active, which is a bit too much. Even if you know about the slowdowns beforehand you can still easily select the brush by accident and have your project slow down to a crawl. There should be a better solution that prevents the brush from slowing down Blender when it is not in use. Just having one segment like the older version of the brush doesn't behave like this.
Exact steps for others to reproduce the error
- Have a fairly high poly mesh at around 1 million vertices selected in Sculpt Mode.
- Select the IK Pose brush with segments and/or smooth iterations activated. You should get heavy slowdowns as shown in the video below.