Improves reconnection responsiveness #519

Job	Run time
B2 gcc-11	5m 48s
B2 msvc-14.2	8m 12s
CMake gcc-11 17 Debug	9m 26s
B2 clang-14	5m 32s
B2 msvc-14.3	6m 54s
CMake gcc-11 20 Release	11m 47s
CMake msvc-14.2 Debug C++17	9m 3s
CMake clang-11 17 Debug	6m 6s
CMake msvc-14.2 Release C++17	8m 43s
CMake clang-11 20 Debug	6m 32s
CMake msvc-14.3 Debug C++20	7m 0s
CMake clang-13 17 Release	9m 59s
CMake msvc-14.3 Release C++20	7m 3s
CMake clang-13 20 Release	9m 41s
CMake clang-14 17 Debug -stdlib=libc++	8m 8s
CMake clang-14 20 Release -stdlib=libc++	12m 5s
	2h 11m 59s

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