Commits on Nov 12, 2023

1. Skip filtering CookieJar when the jar is empty or all cookies hav… …

   …e expired (aio-libs#7819)
   
   The filtering itself and its preparation in `CookieJar.filter_cookies()`
   is expensive. Sometimes there are no cookies in the jar or all cookies
   have expired. Skip filtering and its preparation in this case.
   
   Because the empty check is much cheaper than `_do_expiration()`, I think
   it deserves to be duplicated before and after calling
   `_do_expiration()`.
   
   ```console
   $ python3.11 -m timeit -s 'from collections import defaultdict; d=defaultdict(foo="bar")' \
   > 'if not d: pass'
   50000000 loops, best of 5: 8.3 nsec per loop
   $ python3.11 -m timeit -s 'from collections import defaultdict; d=defaultdict()' \
   > 'if not d: pass'
   50000000 loops, best of 5: 8.74 nsec per loop
   $ python3.11 -m timeit -s 'from aiohttp import CookieJar; cj = CookieJar()' \
   > 'cj._do_expiration()'
   200000 loops, best of 5: 1.86 usec per loop
   ```
   
   (cherry picked from commit dfc3f89)

   

   Rongronggg9 committed Nov 12, 2023
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