Eric V. Smith added the comment:
I see a small difference, but I think it's related to the fact that in the
first example you're concatenating 2 strings (',' and the result of {0}), and
in the 2nd example it's 3 strings ("'", {0}, "',"):
$ echo '",{0}".format(x)'
",{0}".format(x)
$ python -m timeit -s 'x=4' '",{0}".format(x)'
1000000 loops, best of 3: 0.182 usec per loop
$ echo '"'\''{0}'\'',".format(x)'
"'{0}',".format(x)
$ python -m timeit -s 'x=4' '"'\''{0}'\'',".format(x)'
1000000 loops, best of 3: 0.205 usec per loop
If you see a factor of 30x difference in your code, I suspect it's not related
to str.format(), but some other processing in your code.
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