[IPython-dev] slow startup due to script magic

Thomas Kluyver takowl@gmail....
Sat Sep 22 05:40:39 CDT 2012

On 22 September 2012 06:26, Jason Grout <jason-sage@creativetrax.com> wrote:
> We eventually traced it down to the loading of the
> script extension, which by default does 6 popen calls to find the paths
> of scripts in the _script_magics_default method, which are really slow
> (something like 200 ms for the calls on my computer):

Hmm, well spotted. If it's that slow, I think we should avoid doing it
during IPython start up at all. I like it to start up quickly.

Maybe we should keep it simple: rather than checking for the existence
of each interpreter, just set a standard list. It would mean that
users can tab complete e.g. %%pypy, even if they don't have pypy
installed, but I don't think it will be too surprising if they try it
and it fails.


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