Connecting to existing ipython kernel

[Geegee]

I use
(setq python-shell-interpreter "jupyter") (setq python-shell-interpreter-args "console --existing /tmp/tmp_c0vh40k.json")

to connect to a locally running ipython kernel that runs in its own application.
That works so far. Just the auto completion is very laggy. I suspect either it is too eager or
it searches too big of a name space not sure.

How can I customize this behavior?
I think it might be connected to:

■ Warning (python): Your ‘python-shell-interpreter’ doesn’t seem to support readline, yet ‘python-shell-completion-native-enable’ was t and "jupyter" is not part of the ‘python-shell-completion-native-disabled-interpreters’ list. Native completions have been disabled locally. Consider installing the python package "readline".

In my python environment I can not install readline though. Pip suggests it is an issue with the package itself.

If I send a command from org babel a lot of things are printed in the console sadly. Anything I can do about this?

`__PYTHON_EL_eval("try:\n import ast\n with open('/tmp/babel-YboLxo/python-gZXfFG') as __org_babel_python_tmpfile:\n __org_babel_python_ast = ast.parse(__org_babel_python_tmpfile.read())\n __org_babel_python_final = __org_babel_python_ast.body[-1]\n if isinstance(__org_babel_python_final, ast.Expr):\n __org_babel_python_ast.body = __org_babel_python_ast.body[:-1]\n exec(compile(__org_babel_python_ast, '', 'exec'))\n __org_babel_python_final = eval(compile(ast.Expression(\n __org_babel_python_final.value), '', 'eval'))\n else:\n exec(compile(__org_babel_python_ast, '', 'exec'))\n __org_babel_python_final = None\n __org_babel_python_format_value(__org_babel_python_final, '/tmp/babel-YboLxo/python-kUTHRy', ["replace"])\nexcept:\n raise\nfinally:\n print('org_babel_python_eoe')", "")
org_babel_python_eoe

`
Any help appreciated and if there is a better place to ask I am sorry and happy to move the question.