Slow TCP endpoint resolution

resolve.cpp

// this is slow
boost::asio::ip::tcp::resolver resolver1(io_);
auto endpoint_iterator1 = resolver1.resolve({ "8.8.8.8", "53" });
boost::asio::connect(socket_, endpoint_iterator1);

// this is faster
boost::asio::ip::tcp::resolver::query q(boost::asio::ip::tcp::v4(),
                                        "8.8.8.8",
                                        "53");
auto endpoint_iterator2 = resolver2.resolve(q);
boost::asio::connect(socket_, endpoint_iterator2);