Unreal Engine 4.26-Chaos Preview now available on the Epic Games launcher

It is very slow,when I open a cloth in chaos version.it’s about 30K triangles in this cloth.
In nvcloth version,it takes about 5 seconds,and in chaos version,it takes about 10 minutes.
Is it designed to like this,or it’s a bug?
If you can’t reproduce this issue,I can upload a project.