Version dependant slowing down of Gaussian Mixture sampling in Ubuntu 20.04

Here are the prints in 5.9.1 and 5.9 (where in the former case enviroment has been uniformized to 5.9 by specifying some package versions).

Diff for trace is 0 but for logp here it is:

diff logp-dlogp_5_9.txt logp-dlogp_5_9_1.txt

2257c2257
<     └─ exp [id BNS] 't4'
---
>     └─ exp [id BNS] 't1'
2263c2263
<     └─ exp [id BNS] 't4'
---
>     └─ exp [id BNS] 't1'
2267c2267
<     └─ exp [id BNS] 't4'
---
>     └─ exp [id BNS] 't1'
2290c2290
<     ├─ GE [id BOP] 't8'
---
>     ├─ GE [id BOP] 't14'
2300c2300
<     │  ├─ GE [id BOP] 't8'
---
>     │  ├─ GE [id BOP] 't14'

trace_5_9_1.txt (1.4 KB)
logp-dlogp_5_9_1.txt (203.0 KB)
trace_5_9.txt (1.4 KB)
logp-dlogp_5_9.txt (203.0 KB)