Python 3.7.3 (default, Mar 29 2019, 12:10:46)
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IPython 7.5.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: class C:
   ...:     def m(self): return 1
   ...:     @classmethod
   ...:     def c(cls): return 1
   ...:     @staticmethod
   ...:     def s(): return 1
   ...:

In [2]: c = C()

In [3]: %timeit c.m()
64.9 ns ± 0.354 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [4]: %timeit c.c()
76.5 ns ± 1.34 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [5]: %timeit c.s()
67.4 ns ± 0.456 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [6]: %timeit C.c()
82.1 ns ± 1.62 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [7]: %timeit C.s()
71.9 ns ± 0.268 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [8]: