New issue 2790: pypy3 reading big file very slow

Ziqi Liu:

I'm trying to use pypy3 to improve the efficiency of my code. The basic flow is 
reading a very big file and do some processing and output.

pypy3 do improve the speed of the processing part, but very very slow in 
reading big file, much more slower than normal python3.....I suppose pypy3 
doesn't compile it correctly, maybe I need to add some args to improve the 
reading file efficiency?

I read the file with built-in open function
with open(inF1, 'r') as f:
    gtf = [line.split('\t') for line in f]

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