Version dependant slowing down of Gaussian Mixture sampling in Ubuntu 20.04

Atleast now I know the answer to this. This somehow happend because channel priority was set to flexible:

channels:
  - conda-forge
  - bioconda
  - r
  - defaults
auto_activate_base: false
channel_priority: flexible

which result also in a weird installation

pytensor                  2.13.1          py311ha02d727_0  
pytensor-base             2.17.3          py311h320fe9a_0    conda-forge

After changing that to strict, installs the environment as follows:

# packages in environment at /home/avicenna/miniconda3/envs/pymc_env_5_9_1_test6:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                 conda_forge    conda-forge
_openmp_mutex             4.5                  2_kmp_llvm    conda-forge
arviz                     0.16.1             pyhd8ed1ab_1    conda-forge
asttokens                 2.4.1              pyhd8ed1ab_0    conda-forge
atk-1.0                   2.38.0               hd4edc92_1    conda-forge
backports                 1.0                pyhd8ed1ab_3    conda-forge
backports.functools_lru_cache 1.6.5              pyhd8ed1ab_0    conda-forge
binutils_impl_linux-64    2.40                 hf600244_0    conda-forge
binutils_linux-64         2.40                 hbdbef99_2    conda-forge
blas                      2.119                  openblas    conda-forge
blas-devel                3.9.0           19_linux64_openblas    conda-forge
brotli                    1.1.0                hd590300_1    conda-forge
brotli-bin                1.1.0                hd590300_1    conda-forge
bzip2                     1.0.8                h7f98852_4    conda-forge
c-ares                    1.20.1               hd590300_1    conda-forge
ca-certificates           2023.7.22            hbcca054_0    conda-forge
cached-property           1.5.2                hd8ed1ab_1    conda-forge
cached_property           1.5.2              pyha770c72_1    conda-forge
cachetools                5.3.2              pyhd8ed1ab_0    conda-forge
cairo                     1.18.0               h3faef2a_0    conda-forge
certifi                   2023.7.22          pyhd8ed1ab_0    conda-forge
cloudpickle               3.0.0              pyhd8ed1ab_0    conda-forge
comm                      0.1.4              pyhd8ed1ab_0    conda-forge
cons                      0.4.6              pyhd8ed1ab_0    conda-forge
contourpy                 1.1.1           py311h9547e67_1    conda-forge
cycler                    0.12.1             pyhd8ed1ab_0    conda-forge
debugpy                   1.8.0           py311hb755f60_1    conda-forge
decorator                 5.1.1              pyhd8ed1ab_0    conda-forge
etuples                   0.3.9              pyhd8ed1ab_0    conda-forge
exceptiongroup            1.1.3              pyhd8ed1ab_0    conda-forge
executing                 2.0.1              pyhd8ed1ab_0    conda-forge
expat                     2.5.0                hcb278e6_1    conda-forge
fastprogress              1.0.3              pyhd8ed1ab_0    conda-forge
filelock                  3.13.1             pyhd8ed1ab_0    conda-forge
font-ttf-dejavu-sans-mono 2.37                 hab24e00_0    conda-forge
font-ttf-inconsolata      3.000                h77eed37_0    conda-forge
font-ttf-source-code-pro  2.038                h77eed37_0    conda-forge
font-ttf-ubuntu           0.83                 hab24e00_0    conda-forge
fontconfig                2.14.2               h14ed4e7_0    conda-forge
fonts-conda-ecosystem     1                             0    conda-forge
fonts-conda-forge         1                             0    conda-forge
fonttools                 4.43.1          py311h459d7ec_0    conda-forge
freetype                  2.12.1               h267a509_2    conda-forge
fribidi                   1.0.10               h36c2ea0_0    conda-forge
gcc                       12.3.0               h8d2909c_2    conda-forge
gcc_impl_linux-64         12.3.0               he2b93b0_2    conda-forge
gcc_linux-64              12.3.0               h76fc315_2    conda-forge
gdk-pixbuf                2.42.10              h829c605_4    conda-forge
gettext                   0.21.1               h27087fc_0    conda-forge
giflib                    5.2.1                h0b41bf4_3    conda-forge
graphite2                 1.3.13            h58526e2_1001    conda-forge
graphviz                  8.1.0                h28d9a01_0    conda-forge
gtk2                      2.24.33              h90689f9_2    conda-forge
gts                       0.7.6                h977cf35_4    conda-forge
gxx                       12.3.0               h8d2909c_2    conda-forge
gxx_impl_linux-64         12.3.0               he2b93b0_2    conda-forge
gxx_linux-64              12.3.0               h8a814eb_2    conda-forge
h5netcdf                  1.2.0              pyhd8ed1ab_0    conda-forge
h5py                      3.10.0          nompi_py311h3839ddf_100    conda-forge
harfbuzz                  8.2.1                h3d44ed6_0    conda-forge
hdf5                      1.14.2          nompi_h4f84152_100    conda-forge
icu                       73.2                 h59595ed_0    conda-forge
importlib-metadata        6.8.0              pyha770c72_0    conda-forge
importlib_metadata        6.8.0                hd8ed1ab_0    conda-forge
ipykernel                 6.26.0             pyhf8b6a83_0    conda-forge
ipython                   8.17.2             pyh41d4057_0    conda-forge
jedi                      0.19.1             pyhd8ed1ab_0    conda-forge
joblib                    1.3.2              pyhd8ed1ab_0    conda-forge
jupyter_client            8.5.0              pyhd8ed1ab_0    conda-forge
jupyter_core              5.5.0           py311h38be061_0    conda-forge
kernel-headers_linux-64   2.6.32              he073ed8_16    conda-forge
keyutils                  1.6.1                h166bdaf_0    conda-forge
kiwisolver                1.4.5           py311h9547e67_1    conda-forge
krb5                      1.21.2               h659d440_0    conda-forge
lcms2                     2.15                 hb7c19ff_3    conda-forge
ld_impl_linux-64          2.40                 h41732ed_0    conda-forge
lerc                      4.0.0                h27087fc_0    conda-forge
libaec                    1.1.2                h59595ed_1    conda-forge
libblas                   3.9.0           19_linux64_openblas    conda-forge
libbrotlicommon           1.1.0                hd590300_1    conda-forge
libbrotlidec              1.1.0                hd590300_1    conda-forge
libbrotlienc              1.1.0                hd590300_1    conda-forge
libcblas                  3.9.0           19_linux64_openblas    conda-forge
libcurl                   8.4.0                hca28451_0    conda-forge
libdeflate                1.19                 hd590300_0    conda-forge
libedit                   3.1.20191231         he28a2e2_2    conda-forge
libev                     4.33                 h516909a_1    conda-forge
libexpat                  2.5.0                hcb278e6_1    conda-forge
libffi                    3.4.2                h7f98852_5    conda-forge
libgcc-devel_linux-64     12.3.0               h8bca6fd_2    conda-forge
libgcc-ng                 13.2.0               h807b86a_2    conda-forge
libgd                     2.3.3                h119a65a_9    conda-forge
libgfortran-ng            13.2.0               h69a702a_2    conda-forge
libgfortran5              13.2.0               ha4646dd_2    conda-forge
libglib                   2.78.0               hebfc3b9_0    conda-forge
libgomp                   13.2.0               h807b86a_2    conda-forge
libhwloc                  2.9.3           default_h554bfaf_1009    conda-forge
libiconv                  1.17                 h166bdaf_0    conda-forge
libjpeg-turbo             3.0.0                hd590300_1    conda-forge
liblapack                 3.9.0           19_linux64_openblas    conda-forge
liblapacke                3.9.0           19_linux64_openblas    conda-forge
libnghttp2                1.55.1               h47da74e_0    conda-forge
libnsl                    2.0.1                hd590300_0    conda-forge
libopenblas               0.3.24          pthreads_h413a1c8_0    conda-forge
libpng                    1.6.39               h753d276_0    conda-forge
librsvg                   2.56.3               h98fae49_0    conda-forge
libsanitizer              12.3.0               h0f45ef3_2    conda-forge
libsodium                 1.0.18               h36c2ea0_1    conda-forge
libsqlite                 3.43.2               h2797004_0    conda-forge
libssh2                   1.11.0               h0841786_0    conda-forge
libstdcxx-devel_linux-64  12.3.0               h8bca6fd_2    conda-forge
libstdcxx-ng              13.2.0               h7e041cc_2    conda-forge
libtiff                   4.6.0                ha9c0a0a_2    conda-forge
libtool                   2.4.7                h27087fc_0    conda-forge
libuuid                   2.38.1               h0b41bf4_0    conda-forge
libwebp                   1.3.2                h658648e_1    conda-forge
libwebp-base              1.3.2                hd590300_0    conda-forge
libxcb                    1.15                 h0b41bf4_0    conda-forge
libxml2                   2.11.5               h232c23b_1    conda-forge
libzlib                   1.2.13               hd590300_5    conda-forge
llvm-openmp               17.0.4               h4dfa4b3_0    conda-forge
logical-unification       0.4.6              pyhd8ed1ab_0    conda-forge
matplotlib-base           3.8.0           py311h54ef318_2    conda-forge
matplotlib-inline         0.1.6              pyhd8ed1ab_0    conda-forge
minikanren                1.0.3              pyhd8ed1ab_0    conda-forge
mkl                       2022.2.1         h84fe81f_16997    conda-forge
mkl-service               2.4.0           py311hb711fc7_0    conda-forge
multipledispatch          0.6.0                      py_0    conda-forge
munkres                   1.1.4              pyh9f0ad1d_0    conda-forge
ncurses                   6.4                  h59595ed_2    conda-forge
nest-asyncio              1.5.8              pyhd8ed1ab_0    conda-forge
numpy                     1.25.2          py311h64a7726_0    conda-forge
openblas                  0.3.24          pthreads_h7a3da1a_0    conda-forge
openjpeg                  2.5.0                h488ebb8_3    conda-forge
openssl                   3.1.4                hd590300_0    conda-forge
packaging                 23.2               pyhd8ed1ab_0    conda-forge
pandas                    2.1.2           py311h320fe9a_0    conda-forge
pango                     1.50.14              ha41ecd1_2    conda-forge
parso                     0.8.3              pyhd8ed1ab_0    conda-forge
pcre2                     10.40                hc3806b6_0    conda-forge
pexpect                   4.8.0              pyh1a96a4e_2    conda-forge
pickleshare               0.7.5                   py_1003    conda-forge
pillow                    10.1.0          py311ha6c5da5_0    conda-forge
pip                       23.3.1             pyhd8ed1ab_0    conda-forge
pixman                    0.42.2               h59595ed_0    conda-forge
platformdirs              3.11.0             pyhd8ed1ab_0    conda-forge
prompt-toolkit            3.0.39             pyha770c72_0    conda-forge
prompt_toolkit            3.0.39               hd8ed1ab_0    conda-forge
psutil                    5.9.5           py311h459d7ec_1    conda-forge
pthread-stubs             0.4               h36c2ea0_1001    conda-forge
ptyprocess                0.7.0              pyhd3deb0d_0    conda-forge
pure_eval                 0.2.2              pyhd8ed1ab_0    conda-forge
pygments                  2.16.1             pyhd8ed1ab_0    conda-forge
pymc                      5.9.1                hd8ed1ab_0    conda-forge
pymc-base                 5.9.1              pyhd8ed1ab_0    conda-forge
pyparsing                 3.1.1              pyhd8ed1ab_0    conda-forge
pytensor                  2.17.3          py311hb755f60_0    conda-forge
pytensor-base             2.17.3          py311h320fe9a_0    conda-forge
python                    3.11.6          hab00c5b_0_cpython    conda-forge
python-dateutil           2.8.2              pyhd8ed1ab_0    conda-forge
python-graphviz           0.20.1             pyh22cad53_0    conda-forge
python-tzdata             2023.3             pyhd8ed1ab_0    conda-forge
python_abi                3.11                    4_cp311    conda-forge
pytz                      2023.3.post1       pyhd8ed1ab_0    conda-forge
pyzmq                     25.1.1          py311h34ded2d_2    conda-forge
readline                  8.2                  h8228510_1    conda-forge
scikit-learn              1.3.2           py311hc009520_1    conda-forge
scipy                     1.11.3          py311h64a7726_1    conda-forge
setuptools                68.2.2             pyhd8ed1ab_0    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
spyder-kernels            2.4.4           unix_pyh707e725_0    conda-forge
stack_data                0.6.2              pyhd8ed1ab_0    conda-forge
sysroot_linux-64          2.12                he073ed8_16    conda-forge
tbb                       2021.10.0            h00ab1b0_2    conda-forge
threadpoolctl             3.2.0              pyha21a80b_0    conda-forge
tk                        8.6.13               h2797004_0    conda-forge
toolz                     0.12.0             pyhd8ed1ab_0    conda-forge
tornado                   6.3.3           py311h459d7ec_1    conda-forge
traitlets                 5.13.0             pyhd8ed1ab_0    conda-forge
typing-extensions         4.8.0                hd8ed1ab_0    conda-forge
typing_extensions         4.8.0              pyha770c72_0    conda-forge
tzdata                    2023c                h71feb2d_0    conda-forge
wcwidth                   0.2.9              pyhd8ed1ab_0    conda-forge
wheel                     0.41.3             pyhd8ed1ab_0    conda-forge
wurlitzer                 3.0.3              pyhd8ed1ab_0    conda-forge
xarray                    2023.10.1          pyhd8ed1ab_0    conda-forge
xarray-einstats           0.6.0              pyhd8ed1ab_0    conda-forge
xorg-kbproto              1.0.7             h7f98852_1002    conda-forge
xorg-libice               1.1.1                hd590300_0    conda-forge
xorg-libsm                1.2.4                h7391055_0    conda-forge
xorg-libx11               1.8.7                h8ee46fc_0    conda-forge
xorg-libxau               1.0.11               hd590300_0    conda-forge
xorg-libxdmcp             1.1.3                h7f98852_0    conda-forge
xorg-libxext              1.3.4                h0b41bf4_2    conda-forge
xorg-libxrender           0.9.11               hd590300_0    conda-forge
xorg-renderproto          0.11.1            h7f98852_1002    conda-forge
xorg-xextproto            7.3.0             h0b41bf4_1003    conda-forge
xorg-xproto               7.0.31            h7f98852_1007    conda-forge
xz                        5.2.6                h166bdaf_0    conda-forge
zeromq                    4.3.5                h59595ed_0    conda-forge
zipp                      3.17.0             pyhd8ed1ab_0    conda-forge
zlib                      1.2.13               hd590300_5    conda-forge
zstd                      1.5.5                hfc55251_0    conda-forge