🚑 Merge PR #308

This change addresses a significant performance regression that was
introduced in v8.1.0 (see #305), sort-term.

It makes the sockets select timeout shorter to reduce the duration of
each tick in the new connection processing loop.

The proper fix is yet to be created per
#308 (comment)

cheroot/connections.py

@@ -136,9 +136,12 @@ def get_conn(self, server_socket):
         try:
             for fno in socket_dict:
                 self._selector.register(fno, selectors.EVENT_READ)
+            # The timeout value impacts performance and should be carefully
+            # chosen. Ref:
+            # github.com/cherrypy/cheroot/issues/305#issuecomment-663985165
             rlist = [
                 key.fd for key, _event
-                in self._selector.select(timeout=0.1)
+                in self._selector.select(timeout=0.01)
             ]
         except OSError:
             # Mark any connection which no longer appears valid.