More micro benchmarks.
Comparing to current master, there is no substantial difference.
+-------------------------------------------------------------+----------------+------------------------------+
| Benchmark | bench_master38 | bench_issue200 |
+=============================================================+================+==============================+
| call interface (alternate, no conform, not provided) | 395 ns | 414 ns: 1.05x slower (+5%) |
+-------------------------------------------------------------+----------------+------------------------------+
| call interface (no alternate, valid conform, not provided) | 250 ns | 240 ns: 1.04x faster (-4%) |
+-------------------------------------------------------------+----------------+------------------------------+
| read __module__ | 45.3 ns | 43.4 ns: 1.04x faster (-4%) |
+-------------------------------------------------------------+----------------+------------------------------+
| query adapter (no registrations) | 3.23 ms | 3.31 ms: 1.02x slower (+2%) |
+-------------------------------------------------------------+----------------+------------------------------+
| query adapter (all trivial registrations) | 3.93 ms | 4.40 ms: 1.12x slower (+12%) |
+-------------------------------------------------------------+----------------+------------------------------+
| query adapter (all trivial registrations, wide inheritance) | 43.3 us | 45.5 us: 1.05x slower (+5%) |
+-------------------------------------------------------------+----------------+------------------------------+
| query adapter (all trivial registrations, deep inheritance) | 43.2 us | 46.9 us: 1.09x slower (+9%) |
+-------------------------------------------------------------+----------------+------------------------------+
| sort mixed | 361 us | 354 us: 1.02x faster (-2%) |
+-------------------------------------------------------------+----------------+------------------------------+
| contains (populated dict: interfaces) | 61.3 ns | 59.7 ns: 1.03x faster (-3%) |
+-------------------------------------------------------------+----------------+------------------------------+
Not significant (13): call interface (provides; deep); call interface (provides; wide); call interface (no alternate, no conform, not provided); call interface (alternate, invalid conform, not provided); read __name__; read __doc__; read providedBy; sort interfaces; sort implementedBy; contains (empty dict); contains (populated list: interfaces); contains (populated dict: implementedBy); contains (populated list: implementedBy)