diff --git a/src/CraneCtld/TaskScheduler.cpp b/src/CraneCtld/TaskScheduler.cpp
index 6ee30e379..38dedfc1d 100644
--- a/src/CraneCtld/TaskScheduler.cpp
+++ b/src/CraneCtld/TaskScheduler.cpp
@@ -2128,13 +2128,12 @@ bool MinLoadFirst::CalculateRunningNodesAndStartTime_(
     while (!pq.empty() && pq.top()->it->first == time) {
       auto tracker = pq.top();
       pq.pop();
-      if (tracker->satisfied()) {
+      if (tracker->satisfied_flag) {
         satisfied_trackers.try_push_back(tracker, time);
-        if (tracker->genNextUnsatisfied()) pq.emplace(tracker);
       } else {
         satisfied_trackers.try_erase(tracker);
-        if (tracker->genNextSatisfied()) pq.emplace(tracker);
       }
+      if (tracker->genNext()) pq.emplace(tracker);
     }
     if (pq.empty() || satisfied_trackers.kth_time() + task->time_limit <=
                           pq.top()->it->first) {
diff --git a/src/CraneCtld/TaskScheduler.h b/src/CraneCtld/TaskScheduler.h
index 305c6cbdb..156e1d3a3 100644
--- a/src/CraneCtld/TaskScheduler.h
+++ b/src/CraneCtld/TaskScheduler.h
@@ -162,6 +162,7 @@ class MinLoadFirst : public INodeSelectionAlgo {
     const TimeAvailResMap::const_iterator end;
     const ResourceInNode* task_res;
     void* tracker_list_elem;
+    bool satisfied_flag;
 
     TimeAvailResTracker(const CranedId& craned_id,
                         const TimeAvailResMap::const_iterator& begin,
@@ -171,10 +172,17 @@ class MinLoadFirst : public INodeSelectionAlgo {
           it(begin),
           end(end),
           task_res(task_res),
-          tracker_list_elem(nullptr) {}
+          tracker_list_elem(nullptr) {
+      satisfied_flag = satisfied();
+    }
 
     bool satisfied() const { return *task_res <= it->second; }
 
+    bool genNext() {
+      satisfied_flag = !satisfied_flag;  // target state
+      return satisfied_flag ? genNextSatisfied() : genNextUnsatisfied();
+    }
+
     bool genNextUnsatisfied() {
       while (++it != end && satisfied());
       return it != end;