Improves reconnection responsiveness #521

Job	Run time
B2 msvc-14.2	8m 19s
B2 gcc-11	5m 5s
B2 msvc-14.3	7m 49s
CMake gcc-11 17 Debug	9m 25s
B2 clang-14	5m 8s
CMake gcc-11 20 Release	11m 33s
CMake clang-11 17 Debug	6m 22s
CMake msvc-14.2 Debug C++17	7m 19s
CMake clang-11 20 Debug	6m 46s
CMake clang-13 17 Release	9m 32s
CMake msvc-14.2 Release C++17	7m 50s
CMake clang-13 20 Release	10m 0s
CMake msvc-14.3 Debug C++20	7m 44s
CMake msvc-14.3 Release C++20	7m 31s
CMake clang-14 17 Debug -stdlib=libc++	8m 18s
CMake clang-14 20 Release -stdlib=libc++	12m 5s
	2h 10m 46s

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