panel: Performance problems with panel > 0.13 and Lab3

We are experiencing some performance behaviors with panel > 0.13 The problems we are facing are:

• General lab slowness and input lags on Jupyter Lab
• Random kernel crashes while using tools (can also happen in non Panel tools)
• On local Windows machined we cannot use any panel related imports in startup.py files, using panel in said files will cause the kernel to crash and never boot.

We get the following error:

Traceback (most recent call last):
  File "/opt/conda/bin/jupyterhub-singleuser", line 10, in <module>
    sys.exit(main())
  File "/opt/conda/lib/python3.9/site-packages/jupyterhub/singleuser/app.py", line 66, in main
    return SingleUserLabApp.launch_instance()
  File "/opt/conda/lib/python3.9/site-packages/jupyter_core/application.py", line 264, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/opt/conda/lib/python3.9/site-packages/traitlets/config/application.py", line 846, in launch_instance
    app.start()
  File "/opt/conda/lib/python3.9/site-packages/jupyterhub/singleuser/mixins.py", line 645, in start
    super().start()
  File "/opt/conda/lib/python3.9/site-packages/jupyter_server/serverapp.py", line 2669, in start
    self.start_ioloop()
  File "/opt/conda/lib/python3.9/site-packages/jupyter_server/serverapp.py", line 2655, in start_ioloop
    self.io_loop.start()
  File "/opt/conda/lib/python3.9/site-packages/tornado/platform/asyncio.py", line 199, in start
    self.asyncio_loop.run_forever()
  File "/opt/conda/lib/python3.9/asyncio/base_events.py", line 596, in run_forever
    self._run_once()
  File "/opt/conda/lib/python3.9/asyncio/base_events.py", line 1875, in _run_once
    handle = self._ready.popleft()
IndexError: pop from an empty deque

Here is the boken system pip list:

Package                       Version                     Editable project location
----------------------------- --------------------------- --------------------------------------------------------------------
aenum                         2.2.4
aiohttp                       3.8.1
aiosignal                     1.2.0
alabaster                     0.7.12
altair                        4.1.0
analytics-python              1.4.0
anyio                         3.6.1
argon2-cffi                   21.3.0
argon2-cffi-bindings          21.2.0
asttokens                     2.0.5
async-timeout                 4.0.2
atomicwrites                  1.4.0
attrs                         21.4.0
awscli                        1.23.9
Babel                         2.10.1
backcall                      0.2.0
backoff                       1.10.0
beautifulsoup4                4.11.1
bleach                        5.0.0
bokeh                         2.4.3
boto3                         1.22.9
botocore                      1.25.9
cachetools                    5.2.0
certifi                       2022.5.18.1
cffi                          1.15.0
charset-normalizer            2.0.12
cloudpickle                   2.1.0
colorama                      0.4.4
coverage                      6.4.1
cycler                        0.11.0
debugpy                       1.6.0
decorator                     5.1.1
defusedxml                    0.7.1
docopt                        0.6.2
docutils                      0.15.2
entrypoints                   0.4
execnet                       1.9.0
executing                     0.8.3
fastjsonschema                2.15.3
filelock                      3.3.1
flake8                        3.8.3
fonttools                     4.33.3
frozenlist                    1.3.0
fsspec                        2022.5.0
gcsfs                         2022.5.0
google-api-core               2.8.1
google-auth                   2.6.6
google-auth-oauthlib          0.5.1
google-cloud-core             2.3.0
google-cloud-storage          2.3.0
google-crc32c                 1.3.0
google-resumable-media        2.3.3
googleapis-common-protos      1.56.2
hybridcontents                0.3.0
icdiff                        2.0.5
idna                          3.3
imagesize                     1.3.0
importlib-metadata            4.11.4
imubit-analytics              0.0.3
iniconfig                     1.1.1
iniherit                      0.3.9
ipyaggrid                     0.2.1
ipydatetime                   1.2.0
ipykernel                     6.13.1
ipython                       8.4.0
ipython-genutils              0.2.0
ipywidgets                    7.7.0
isort                         5.6.4
jedi                          0.18.1
jenkinsapi                    0.3.11
Jinja2                        3.1.2
jmespath                      1.0.0
joblib                        1.1.0
json5                         0.9.8
jsonschema                    4.6.0
jupyter                       1.0.0
jupyter-bokeh                 3.0.4
jupyter-client                7.3.3
jupyter-console               6.4.3
jupyter-core                  4.10.0
jupyter-server                1.17.1
jupyterlab                    3.4.2
jupyterlab-pygments           0.2.2
jupyterlab-server             2.14.0
jupyterlab-widgets            1.1.0
kiwisolver                    1.4.2
llvmlite                      0.38.1
Markdown                      3.3.7
MarkupSafe                    2.1.1
matplotlib                    3.5.1
matplotlib-inline             0.1.3
mccabe                        0.6.1
mistune                       0.8.4
mock                          3.0.5
mock-generator                1.0.0
monotonic                     1.6
multidict                     6.0.2
nbclassic                     0.3.7
nbclient                      0.6.4
nbconvert                     6.5.0
nbformat                      5.4.0
nbval                         0.9.6
nest-asyncio                  1.5.5
nose                          1.3.7
notebook                      6.4.12
notebook-shim                 0.1.0
numba                         0.55.2
numexpr                       2.8.1
numpy                         1.22.0
oauthlib                      3.2.0
packaging                     21.3
pandas                        1.2.5
pandocfilters                 1.5.0
panel                         0.13.1
param                         1.12.1
parso                         0.8.3
pickleshare                   0.7.5
Pillow                        9.1.1
pip                           22.1.2
pluggy                        0.13.1
pprintpp                      0.4.0
prometheus-client             0.14.1
prompt-toolkit                3.0.29
protobuf                      3.20.1
psutil                        5.9.1
psycopg2-binary               2.9.3
pure-eval                     0.2.2
py                            1.11.0
pyasn1                        0.4.8
pyasn1-modules                0.2.8
pycodestyle                   2.6.0
pycparser                     2.21
pyct                          0.4.8
pydantic                      1.9.0
pyflakes                      2.2.0
Pygments                      2.12.0
pymongo                       4.0.1
pyparsing                     3.0.9
PyPika                        0.48.8
pyrsistent                    0.18.1
pytest                        6.2.3
pytest-asyncio                0.14.0
pytest-cov                    2.11.1
pytest-forked                 1.4.0
pytest-icdiff                 0.5
pytest-mock                   3.6.1
pytest-repeat                 0.9.1
pytest-xdist                  2.4.0
python-dateutil               2.8.2
python-json-logger            0.1.11
python-slugify                6.1.2
pytimeparse                   1.1.8
pytz                          2022.1
pyviz-comms                   2.2.0
pywin32                       304
pywinpty                      2.0.5
PyYAML                        5.3.1
pyzmq                         23.1.0
qtconsole                     5.3.1
QtPy                          2.1.0
requests                      2.27.1
requests-oauthlib             1.3.1
rsa                           4.7.2
s3contents                    0.6.0
s3fs                          0.4.2
s3transfer                    0.5.2
scikit-learn                  1.1.1
scipy                         1.8.1
seaborn                       0.11.2
selenium                      3.141.0
Send2Trash                    1.8.0
setuptools                    62.3.3
shap                          0.40.0
simpleeval                    0.9.11
simplejson                    3.17.6
six                           1.16.0
sklearn                       0.0
slicer                        0.0.7
sniffio                       1.2.0
snowballstemmer               2.2.0
soupsieve                     2.3.2.post1
Sphinx                        3.2.1
sphinx-rtd-theme              0.5.0
sphinxcontrib-applehelp       1.0.2
sphinxcontrib-devhelp         1.0.2
sphinxcontrib-htmlhelp        2.0.0
sphinxcontrib-jsmath          1.0.1
sphinxcontrib-qthelp          1.0.3
sphinxcontrib-serializinghtml 1.1.5
stack-data                    0.2.0
tables                        3.7.0
tabulate                      0.8.9
terminado                     0.15.0
testpath                      0.6.0
text-unidecode                1.3
threadpoolctl                 3.1.0
timedb                        3.29.2
tinycss2                      1.1.1
toml                          0.10.2
toolz                         0.11.2
tornado                       6.1
traitlets                     5.2.2.post1
typing_extensions             4.2.0
urllib3                       1.26.9
wcwidth                       0.2.5
webencodings                  0.5.1
websocket-client              1.3.2
wheel                         0.34.2
widgetsnbextension            3.6.0
yapf                          0.30.0
yarl                          1.7.2
yoyo-migrations               5.0.5
zipp                          3.8.0

And here is a pip list of the working environment:

Package                           Version                     Editable project location
--------------------------------- --------------------------- ------------------------------------------------------------------
aenum                             2.2.4
aiohttp                           3.8.1
aiosignal                         1.2.0
alabaster                         0.7.12
altair                            4.1.0
analytics-python                  1.4.0
anyio                             3.6.1
argon2-cffi                       21.3.0
argon2-cffi-bindings              21.2.0
asttokens                         2.0.5
async-timeout                     4.0.2
atomicwrites                      1.4.0
attrs                             21.4.0
awscli                            1.23.9
Babel                             2.10.1
backcall                          0.2.0
backoff                           1.10.0
beautifulsoup4                    4.11.1
bleach                            5.0.0
bokeh                             2.4.3
boto3                             1.22.9
botocore                          1.25.9
cachetools                        5.2.0
certifi                           2022.5.18.1
cffi                              1.15.0
charset-normalizer                2.0.12
click                             8.0.3
cloudpickle                       2.1.0
colorama                          0.4.4
coverage                          6.4.1
cycler                            0.11.0
debugpy                           1.6.0
decorator                         5.1.1
defusedxml                        0.7.1
docopt                            0.6.2
docutils                          0.15.2
entrypoints                       0.4
execnet                           1.9.0
executing                         0.8.3
Faker                             13.3.4
fastjsonschema                    2.15.3
filelock                          3.3.1
flake8                            3.8.3
fonttools                         4.33.3
frozenlist                        1.3.0
fsspec                            2022.5.0
gcsfs                             2022.5.0
google-api-core                   2.8.1
google-auth                       2.7.0
google-auth-oauthlib              0.5.2
google-cloud-core                 2.3.1
google-cloud-storage              2.4.0
google-crc32c                     1.3.0
google-resumable-media            2.3.3
googleapis-common-protos          1.56.2
hybridcontents                    0.3.0
icdiff                            2.0.5
idna                              3.3
imagesize                         1.3.0
importlib-metadata                4.11.4
imubit-analytics                  0.0.3
iniconfig                         1.1.1
iniherit                          0.3.9
ipyaggrid                         0.2.1
ipydatetime                       1.2.0
ipykernel                         6.13.1
ipython                           8.4.0
ipython-genutils                  0.2.0
ipywidgets                        7.7.0
isort                             5.6.4
jedi                              0.18.1
jenkinsapi                        0.3.11
Jinja2                            3.1.2
jmespath                          1.0.0
joblib                            1.1.0
json5                             0.9.8
jsonschema                        4.6.0
jupyter-bokeh                     3.0.4
jupyter-client                    7.3.4
jupyter-contrib-core              0.3.3
jupyter-contrib-nbextensions      0.5.1
jupyter-core                      4.10.0
jupyter-highlight-selected-word   0.2.0
jupyter-latex-envs                1.4.6
jupyter-nbextensions-configurator 0.4.1
jupyter-server                    1.17.1
jupyterlab                        3.4.0
jupyterlab-pygments               0.2.2
jupyterlab-server                 2.14.0
jupyterlab-widgets                1.1.0
jupyterthemes                     0.20.0
kiwisolver                        1.4.3
kwargs                            1.0.1
lesscpy                           0.15.0
llvmlite                          0.38.1
lxml                              4.7.1
Markdown                          3.3.7
MarkupSafe                        2.1.1
matplotlib                        3.5.1
matplotlib-inline                 0.1.3
mccabe                            0.6.1
mistune                           0.8.4
mock                              3.0.5
mock-generator                    1.0.0
monotonic                         1.6
multidict                         6.0.2
mypy-extensions                   0.4.3
nbclassic                         0.3.7
nbclient                          0.6.4
nbconvert                         6.5.0
nbformat                          5.4.0
nbval                             0.9.6
nest-asyncio                      1.5.5
nose                              1.3.7
notebook                          6.4.12
notebook-shim                     0.1.0
numba                             0.55.2
numexpr                           2.8.1
numpy                             1.22.4
oauthlib                          3.2.0
packaging                         21.3
pandas                            1.2.5
pandocfilters                     1.5.0
panel                             0.13.1
param                             1.12.1
parameterized                     0.8.1
parso                             0.8.3
pathspec                          0.9.0
pbr                               5.8.1
pickleshare                       0.7.5
Pillow                            9.1.1
pip                               22.1.2
platformdirs                      2.4.1
pluggy                            0.13.1
ply                               3.11
pprintpp                          0.4.0
progress                          1.6
prometheus-client                 0.14.1
prompt-toolkit                    3.0.29
protobuf                          3.20.1
psutil                            5.9.1
psycopg2-binary                   2.9.3
pure-eval                         0.2.2
py                                1.11.0
pyasn1                            0.4.8
pyasn1-modules                    0.2.8
pycodestyle                       2.6.0
pycparser                         2.21
pyct                              0.4.8
pydantic                          1.9.0
pyflakes                          2.2.0
Pygments                          2.12.0
pymongo                           4.0.1
pyparsing                         3.0.9
PyPika                            0.48.8
pyrsistent                        0.18.1
PyRSS2Gen                         1.1
pytest                            6.2.3
pytest-asyncio                    0.14.0
pytest-cov                        2.11.1
pytest-datadir-ng                 1.1.1
pytest-forked                     1.4.0
pytest-icdiff                     0.5
pytest-mock                       3.6.1
pytest-pythonpath                 0.7.4
pytest-repeat                     0.9.1
pytest-xdist                      2.4.0
python-dateutil                   2.8.2
python-json-logger                0.1.11
python-slugify                    6.1.2
pytimeparse                       1.1.8
pytz                              2022.1
pyviz-comms                       2.2.0
pywin32                           304
pywinpty                          2.0.5
PyYAML                            6.0
pyzmq                             23.1.0
requests                          2.28.0
requests-oauthlib                 1.3.1
rsa                               4.7.2
s3contents                        0.6.0
s3fs                              0.4.2
s3transfer                        0.5.2
scikit-learn                      1.1.1
scipy                             1.8.1
seaborn                           0.11.2
selenium                          3.141.0
self                              2020.12.3
Send2Trash                        1.8.0
setuptools                        62.4.0
shap                              0.40.0
simpleeval                        0.9.11
simplejson                        3.17.6
six                               1.16.0
sklearn                           0.0
slicer                            0.0.7
sniffio                           1.2.0
snowballstemmer                   2.2.0
soupsieve                         2.3.2.post1
Sphinx                            3.2.1
sphinx-rtd-theme                  0.5.0
sphinxcontrib-applehelp           1.0.2
sphinxcontrib-devhelp             1.0.2
sphinxcontrib-htmlhelp            2.0.0
sphinxcontrib-jsmath              1.0.1
sphinxcontrib-qthelp              1.0.3
sphinxcontrib-serializinghtml     1.1.5
sqlparse                          0.4.2
stack-data                        0.2.0
success                           1.0.0
tables                            3.7.0
tabulate                          0.8.9
terminado                         0.15.0
testpath                          0.6.0
text-unidecode                    1.3
threadpoolctl                     3.1.0
timedb                            3.29.2
tinycss2                          1.1.1
toml                              0.10.2
tomli                             1.2.3
toolz                             0.11.2
tornado                           6.1
tqdm                              4.64.0
traitlets                         5.2.2.post1
typing_extensions                 4.2.0
urllib3                           1.26.9
versioneer                        0.22
virtualenv                        20.14.1
wcwidth                           0.2.5
webencodings                      0.5.1
websocket-client                  1.3.2
wheel                             0.34.2
widgetsnbextension                3.6.0
xeus-python                       0.13.6
xeus-python-shell                 0.2.0
yapf                              0.30.0
yarl                              1.7.2
yoyo-migrations                   5.0.5
zipp                              3.8.0