[WorkerLocalData] Reserve space in std::vector

emper/WorkerLocalData.hpp

@@ -25,6 +25,7 @@ class WorkerLocalData {
 
 	auto getSnapshot() -> std::vector<D> {
 		std::vector<D> res;
+		res.reserve(workerLocalData.size());
 		for (D* data : workerLocalData) {
 			res.emplace_back(*data);
 		}