Jimmy Lai <yuri...@gmail.com> added the comment: @vstinner Thanks for the new benchmark, it provides more detailed wins: It's 1.64x faster for future object and 1.23x faster for non-future object. $ ./python.exe -m perf compare_to isfuture_original_2.json isfuture_optimized_2.json future: Mean +- std dev: [isfuture_original_2] 224 ns +- 8 ns -> [isfuture_optimized_2] 135 ns +- 2 ns: 1.66x faster (-40%) task: Mean +- std dev: [isfuture_original_2] 224 ns +- 6 ns -> [isfuture_optimized_2] 137 ns +- 3 ns: 1.64x faster (-39%) regular_func: Mean +- std dev: [isfuture_original_2] 443 ns +- 5 ns -> [isfuture_optimized_2] 361 ns +- 5 ns: 1.23x faster (-18%) str: Mean +- std dev: [isfuture_original_2] 449 ns +- 15 ns -> [isfuture_optimized_2] 360 ns +- 12 ns: 1.25x faster (-20%)
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