diff --git a/api/task.go b/api/task.go
index 8a35f5f..f01cea6 100644
--- a/api/task.go
+++ b/api/task.go
@@ -63,6 +63,7 @@ func (api *WebAPI) SubmitTask(r *Request) {
 			Message:        "Too many requests",
 			RateLimitDelay: delay,
 		}, 429)
+		reservation.Cancel()
 		return
 	}
 
@@ -114,6 +115,7 @@ func (api *WebAPI) GetTaskFromProject(r *Request) {
 			Message:        "Too many requests",
 			RateLimitDelay: delay,
 		}, 429)
+		reservation.Cancel()
 		return
 	}
 
diff --git a/web/angular/src/app/project-dashboard/project-dashboard.component.html b/web/angular/src/app/project-dashboard/project-dashboard.component.html
index d54dc5f..e13b181 100644
--- a/web/angular/src/app/project-dashboard/project-dashboard.component.html
+++ b/web/angular/src/app/project-dashboard/project-dashboard.component.html
@@ -18,6 +18,10 @@
             <p>{{"project.motd" | translate}}:</p>
             <pre *ngIf="project">{{project.motd}}</pre>
 
+            <p>{{"project.task_per_second" | translate}}:
+                <span class="text-mono" *ngIf="project">{{avgTask | number}}/s</span>
+            </p>
+
             <div style="display: flex; align-items: center; justify-content: center">
                 <div id="timeline-wrapper">
                     <canvas id="timeline"></canvas>
diff --git a/web/angular/src/app/project-dashboard/project-dashboard.component.ts b/web/angular/src/app/project-dashboard/project-dashboard.component.ts
index 2192e7c..2137dce 100644
--- a/web/angular/src/app/project-dashboard/project-dashboard.component.ts
+++ b/web/angular/src/app/project-dashboard/project-dashboard.component.ts
@@ -26,6 +26,7 @@ export class ProjectDashboardComponent implements OnInit {
     private timeline: Chart;
     private statusPie: Chart;
     private assigneesPie: Chart;
+    private avgTask: number;
 
 
     private colors = {
@@ -336,6 +337,8 @@ export class ProjectDashboardComponent implements OnInit {
                                 this.assignees = data.content.assignees;
                                 this.setupAssigneesPie();
                             });
+
+                        this.averageTaskPerSecond();
                     })
             },
             error => {
@@ -371,6 +374,27 @@ export class ProjectDashboardComponent implements OnInit {
         this.setPaused(false)
     }
 
+    private averageTaskPerSecond() {
+
+        const averageDelta = ([x, ...xs]) => {
+            if (x === undefined)
+                return NaN;
+            else
+                return xs.reduce(
+                    ([acc, last], x) => [acc + (x - last), x],
+                    [0, x]
+                ) [0] / xs.length
+        };
+
+        let interval = this.snapshots.length > 1 ? this.snapshots[0].time_stamp - this.snapshots[1].time_stamp : 0;
+
+        if (interval != 0) {
+            this.avgTask = averageDelta(this.snapshots.reverse().map(s => s.closed_task_count) as any) / interval;
+        } else {
+            return 0
+        }
+    }
+
     private setPaused(paused: boolean) {
         this.dialog.open(AreYouSureComponent, {
             width: '250px',
diff --git a/web/angular/src/assets/i18n/en.json b/web/angular/src/assets/i18n/en.json
index 4e8ad98..0cd1c47 100644
--- a/web/angular/src/assets/i18n/en.json
+++ b/web/angular/src/assets/i18n/en.json
@@ -73,7 +73,8 @@
         "reset_response": "Reset failed tasks: ",
         "assign_rate": "Task assign rate limit",
         "submit_rate": "Task submit rate limit",
-        "rate": "per second"
+        "rate": "per second",
+        "task_per_second": "Completed tasks per second"
     },
     "dashboard": {
         "title": "Dashboard for",
diff --git a/web/angular/src/assets/i18n/fr.json b/web/angular/src/assets/i18n/fr.json
index cef1007..008d052 100644
--- a/web/angular/src/assets/i18n/fr.json
+++ b/web/angular/src/assets/i18n/fr.json
@@ -73,7 +73,8 @@
         "reset_response": "Réinitialisé les tâches en échec: ",
         "assign_rate": "Taux d'assignation de tâches",
         "submit_rate": "Taux de soumission de tâches",
-        "rate": "par seconde"
+        "rate": "par seconde",
+        "task_per_second": "Tâches par seconde"
     },
     "dashboard": {
         "title": "Tableau de bord pour ",