Some CLI commands are unexpectedly slow

[alwx]

Rasa version: 2.3.1 (used main branch, commit hash: 2574c46e9576607a7b8de39f823ff3e5c01a475c)

Rasa SDK version (if used & relevant): 2.3.1

Rasa X version (if used & relevant):

Python version: 3.7 / 3.8

Operating system (windows, osx, ...): MacOS / Windows

Issue:
We made an investigation of how long it takes to execute tests, and one of the conclusions that can certainly be made is that some CLI tests are unexpectedly slow.
Several examples:

• tests/cli/test_rasa_train.py::test_train_help, tests/cli/test_rasa_train.py::test_train_nlu_help and other similar commands often take 5 seconds. But all of them are just some simple commands that only print some help information.
• tests/cli/test_cli.py::test_cli_start might take up to 20 seconds on Windows (it just executes rasa --help and should be really fast)
• it seems to affect other commands as well. However, we decided to handle other cases separately.

Here you can find more information about the time it takes to execute CLI tests: https://gist.github.com/alwx/fc3334473b046231f1ed35b0bd6e30e3

See more details about time measurements: https://docs.google.com/spreadsheets/d/1tDRD0vWaLW91W1wPj5h__dwXuXioRt9aBPYyF1n4MjI/edit#gid=57091041

Definition of done:

• --help commands run in less than 1s

Command or request that led to error:

pytest tests/cli

[joejuzl]

Is this still relevant after #8141 ?

[TyDunn]

@alwx can we close this?

[alwx]

@TyDunn yes, seems like it can be closed.