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Sun Jul 9 12:12:28 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-July/148562.html

On 2017-07-09 15:08, Bhavishya wrote:
> Hello,
> 
> 1).I was going through the code of *python pickle* to search any 
> optimization possibility.But the only thing that I found very alarming 
> was again the import time(I tried with lazy-import but it didn't helped 
> much.)
> 
> I found py3 to be ~45 times slower on*initial imports(very raw 
> measure..using "time." ) *as compared to py2 on an usual example.
> 
> py3->
> ./python -c '
> favorite_color = { "lion": "yellow", "kitty": "red" }
> pickle.dump( favorite_color, open( "save.p", "wb" ) )'
> 0.009715557098388672(time taken to do initial imports...measured using 
> *time.time()* )
> 
> py2->
> ./python -c '
> favorite_color = { "lion": "yellow", "kitty": "red" }
> pickle.dump( favorite_color, open( "save.p", "wb" ) )'
> 0.000236034393311(time taken to do initial imports...measured using 
> *time.time()* )
> 
> Do you have any thought/ideas on improving this?
> 
Python 3 is using Unicode strings, whereas Python 2 is using bytestrings.
What you show above are very short (in time) examples (less than 1/100 
of a second), so they're not that meaningful.

If you had timed pickling a substantial object (the same object in both 
cases) and it took a significant amount of time and you found a 
significant slowdown, then it would be worth looking into further.

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[Python-Dev] Pure pickle bechmark.