I have ran performance tests of cython and it seems that enabling shared utility module causes performance degradation. Here are most affected (> 10% performance degradation):
2026-02-11 14:12:01 ### Benchmark 'bm_slice_memoryview' (min/median/max/ ±% of median):
2026-02-11 14:12:01 Cython 'master' = 168.789 nsec, 169.037 nsec, 169.417 nsec
2026-02-11 14:12:01 S-Cython 'master' = 265.030 nsec, 265.359 nsec, 265.745 nsec ( +57.0 %)
2026-02-11 14:12:01 ### Benchmark 'bm_create_inner_func_plain' (min/median/max/ ±% of median):
2026-02-11 14:12:01 Cython 'master' = 178.644 nsec, 179.003 nsec, 179.423 nsec
2026-02-11 14:12:01 S-Cython 'master' = 209.291 nsec, 209.592 nsec, 214.308 nsec ( +17.1 %)
2026-02-11 14:12:01 ### Benchmark 'fused_args_1' (min/median/max/ ±% of median):
2026-02-11 14:12:01 Cython 'master' = 2.360 usec, 2.381 usec, 2.400 usec
2026-02-11 14:12:01 S-Cython 'master' = 3.770 usec, 3.782 usec, 3.806 usec ( +58.9 %)
2026-02-11 14:12:01 ### Benchmark 'fused_args_2' (min/median/max/ ±% of median):
2026-02-11 14:12:01 Cython 'master' = 1.257 usec, 1.262 usec, 1.269 usec
2026-02-11 14:12:01 S-Cython 'master' = 1.449 usec, 1.451 usec, 1.455 usec ( +15.0 %)
2026-02-11 14:12:01 ### Benchmark 'bm_getitem_tuple' (min/median/max/ ±% of median):
2026-02-11 14:12:01 Cython 'master' = 36.994 usec, 37.552 usec, 38.014 usec
2026-02-11 14:12:01 S-Cython 'master' = 42.142 usec, 42.312 usec, 42.718 usec ( +12.7 %)
2026-02-11 14:12:01 ### Benchmark 'bm_getitem_ext' (min/median/max/ ±% of median):
2026-02-11 14:12:01 Cython 'master' = 202.649 usec, 204.566 usec, 204.844 usec
2026-02-11 14:12:01 S-Cython 'master' = 225.850 usec, 227.740 usec, 228.050 usec ( +11.3 %)
2026-02-11 14:12:01 ### Benchmark 'bm_cmp_int_obj' (min/median/max/ ±% of median):
2026-02-11 14:12:01 Cython 'master' = 1.347 usec, 1.359 usec, 1.373 usec
2026-02-11 14:12:01 S-Cython 'master' = 1.694 usec, 1.706 usec, 1.709 usec ( +25.5 %)
2026-02-11 14:12:01 ### Benchmark 'bm_cmp_str_obj' (min/median/max/ ±% of median):
2026-02-11 14:12:01 Cython 'master' = 2.068 usec, 2.110 usec, 2.120 usec
2026-02-11 14:12:01 S-Cython 'master' = 2.337 usec, 2.375 usec, 2.581 usec ( +12.6 %)
Describe your issue
I have ran performance tests of cython and it seems that enabling shared utility module causes performance degradation. Here are most affected (> 10% performance degradation):
Not sure if there is anything that can be done except documenting it?