TAICHI is very slow since version 0.6.21 (Jul 22, 2020)

Hi Taichi Team,
I have tested different version of Taichi and I found that since version 0.6.21 (Jul 22, 2020), , Taichi is significantly slower even in GPU.

Version 0.6.20 is the latest Fastest Taichi.

What happen?
Please help

Thank you, best regards

Sounds like an interesting finding :slight_smile: Any script to reproduce?