python 3 TextIOWrapper.tell() is significantly slower than in python 2

[tfox]

Hi, I'm having a function ported from python 2 to python 3 and found that the TextIOWrapper.tell() is the cause that notably slows down the perfomance.

import timeit
f=open('file')
timeit.timeit(f.tell)

In python 3, the execution time of above code example is roughly 0.58s, while in python 2 it's only 0.07s.

Is there any workaround to solve this problem?

[Larz60+]

tell is a simple instruction that gets the byte offset from beginning of file, and should not be slow at all

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>>> import time
>>> fp = open('woogie.txt')
>>> def testtime():
...     s = time.time()
...     fp.tell()
...     e = time.time()
...     print(f'eplapsed time: {e - s}')
... 
>>> testtime()
eplapsed time: 1.0251998901367188e-05