Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Without the guards the incremental cost drops to 10%.

$ python3.10 -m timeit -r11 -s 'from patched_noguards import Fraction as F' -s 
'a=F(10,3)' -s 'b=F(6, 5)' 'a * b'
100000 loops, best of 11: 2.02 usec per loop

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<https://bugs.python.org/issue43420>
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