Windshear procedure is something we do when we are at a too low energy state, while we wait for the energy to come back. And it sure that it is going to come back. It is like we are surrounded by too many indians throwing arrows at us, but the cavalry is coming anytime. The game is not to die stupidly before the cavalry arrives.
The only thing that matters is not to lose altitude. Speed or any other thing is totally irrelevant during that time. Once the energy comes back, then you continue normally, retracting flaps and all.