Performance Issue: Startup very slow

Python version: 3.7.4 IPython version: 7.6.1

When start ipython from command line. It will take long time.

Python Startup:

$ time python -c exit

real	0m0.015s
user	0m0.015s
sys	0m0.000s

IPython Startup:

$ time ipython -c exit

real	0m0.523s
user	0m0.365s
sys	0m0.039s

It is slower than bpython.

I am wondering if it is possible to make optimization.

[AgilentGCMS]

I found this thread searching for a solution to my slow ipython startup times. My hardware is reasonably fast (28-core Intel Broadwell), and yet ipython takes so much longer than python:

$ time python -c exit

real	0m0.052s
user	0m0.018s
sys	0m0.022s

$ time ipython -c exit

real	0m2.542s
user	0m0.667s
sys	0m0.907s

I’m not loading any additional modules in ipython, and still!

[eendebakpt]

@Carreau @stevenleeS0ht To test the IPython loading time I did the following:

# pip install importtime-waterfall tuna

python -X importtime -c "import IPython" 2> i.log
tuna i.log

This results in the following overview:

Import time is spend at various places, with some bigger components (e.g. prompt_toolkit, jedi).