diff --git a/src/webui/www/private/scripts/client.js b/src/webui/www/private/scripts/client.js
index 9f211db83..8f2feb37b 100644
--- a/src/webui/www/private/scripts/client.js
+++ b/src/webui/www/private/scripts/client.js
@@ -41,6 +41,7 @@ var queueing_enabled = true;
 var serverSyncMainDataInterval = 1500;
 var customSyncMainDataInterval = null;
 
+let syncRequestInProgress = false;
 var clipboardEvent;
 
 var CATEGORIES_ALL = 1;
@@ -334,7 +335,7 @@ window.addEvent('load', function() {
     var syncMainData = function() {
         var url = new URI('api/v2/sync/maindata');
         url.setData('rid', syncMainDataLastResponseId);
-        new Request.JSON({
+        const request = new Request.JSON({
             url: url,
             noCache: true,
             method: 'get',
@@ -342,8 +343,8 @@ window.addEvent('load', function() {
                 var errorDiv = $('error_div');
                 if (errorDiv)
                     errorDiv.set('html', 'QBT_TR(qBittorrent client is not reachable)QBT_TR[CONTEXT=HttpServer]');
-                clearTimeout(syncMainDataTimer);
-                syncMainDataTimer = syncMainData.delay(2000);
+                syncRequestInProgress = false;
+                syncData(2000);
             },
             onSuccess: function(response) {
                 $('error_div').set('html', '');
@@ -426,18 +427,26 @@ window.addEvent('load', function() {
                         // re-select previously selected rows
                         torrentsTable.reselectRows(torrentsTableSelectedRows);
                 }
-                clearTimeout(syncMainDataTimer);
-                syncMainDataTimer = syncMainData.delay(getSyncMainDataInterval());
+                syncRequestInProgress = false;
+                syncData(getSyncMainDataInterval())
             }
-        }).send();
+        });
+        syncRequestInProgress = true;
+        request.send();
     };
 
     updateMainData = function() {
         torrentsTable.updateTable();
-        clearTimeout(syncMainDataTimer);
-        syncMainDataTimer = syncMainData.delay(100);
+        syncData(100);
     };
 
+    const syncData = function(delay) {
+        if (!syncRequestInProgress){
+            clearTimeout(syncMainDataTimer);
+            syncMainDataTimer = syncMainData.delay(delay);
+        }
+    }
+
     var processServerState = function() {
         var transfer_info = friendlyUnit(serverState.dl_info_speed, true);
         if (serverState.dl_rate_limit > 0)
@@ -459,7 +468,7 @@ window.addEvent('load', function() {
         $('DHTNodes').set('html', 'QBT_TR(DHT: %1 nodes)QBT_TR[CONTEXT=StatusBar]'.replace("%1", serverState.dht_nodes));
 
         // Statistics dialog
-        if (document.getElementById("statisticspage")) {
+        if (document.getElementById("statisticsContent")) {
             $('AlltimeDL').set('html', friendlyUnit(serverState.alltime_dl, false));
             $('AlltimeUL').set('html', friendlyUnit(serverState.alltime_ul, false));
             $('TotalWastedSession').set('html', friendlyUnit(serverState.total_wasted_session, false));
@@ -607,8 +616,7 @@ window.addEvent('load', function() {
         $("mainColumn").removeClass("invisible");
 
         customSyncMainDataInterval = null;
-        clearTimeout(syncMainDataTimer);
-        syncMainDataTimer = syncMainData.delay(100);
+        syncData(100);
 
         hideSearchTab();
     };
diff --git a/src/webui/www/private/statistics.html b/src/webui/www/private/statistics.html
index 580ef495e..dffd3ecc9 100644
--- a/src/webui/www/private/statistics.html
+++ b/src/webui/www/private/statistics.html
@@ -1,59 +1,59 @@
-<h3>QBT_TR(User statistics)QBT_TR[CONTEXT=StatsDialog]</h3>
-<table style="width:100%">
-    <tr>
-        <td>QBT_TR(All-time upload:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="AlltimeUL" class="statisticsValue"></td>
-    </tr>
-    <tr>
-        <td>QBT_TR(All-time download:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="AlltimeDL" class="statisticsValue"></td>
-    </tr>
-    <tr>
-        <td>QBT_TR(All-time share ratio:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="GlobalRatio" class="statisticsValue"></td>
-    </tr>
-    <tr>
-        <td>QBT_TR(Session waste:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="TotalWastedSession" class="statisticsValue"></td>
-    </tr>
-    <tr>
-        <td>QBT_TR(Connected peers:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="TotalPeerConnections" class="statisticsValue"></td>
-    </tr>
-</table>
-
-<h3>QBT_TR(Cache statistics)QBT_TR[CONTEXT=StatsDialog]</h3>
-<table style="width:100%">
-    <tr>
-        <td>QBT_TR(Read cache hits:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="ReadCacheHits" class="statisticsValue"></td>
-    </tr>
-    <tr>
-        <td>QBT_TR(Total buffer size:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="TotalBuffersSize" class="statisticsValue"></td>
-    </tr>
-</table>
-
-<h3>QBT_TR(Performance statistics)QBT_TR[CONTEXT=StatsDialog]</h3>
-<table style="width:100%">
-    <tr>
-        <td>QBT_TR(Write cache overload:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="WriteCacheOverload" class="statisticsValue"></td>
-    </tr>
-    <tr>
-        <td>QBT_TR(Read cache overload:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="ReadCacheOverload" class="statisticsValue"></td>
-    </tr>
-    <tr>
-        <td>QBT_TR(Queued I/O jobs:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="QueuedIOJobs" class="statisticsValue"></td>
-    </tr>
-    <tr>
-        <td>QBT_TR(Average time in queue:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="AverageTimeInQueue" class="statisticsValue"></td>
-    </tr>
-    <tr>
-        <td>QBT_TR(Total queued size:)QBT_TR[CONTEXT=StatsDialog]</td>
-        <td id="TotalQueuedSize" class="statisticsValue"></td>
-    </tr>
-</table>
+<div id="statisticsContent">
+    <h3>QBT_TR(User statistics)QBT_TR[CONTEXT=StatsDialog]</h3>
+    <table style="width:100%">
+        <tr>
+            <td>QBT_TR(All-time upload:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="AlltimeUL" class="statisticsValue"></td>
+        </tr>
+        <tr>
+            <td>QBT_TR(All-time download:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="AlltimeDL" class="statisticsValue"></td>
+        </tr>
+        <tr>
+            <td>QBT_TR(All-time share ratio:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="GlobalRatio" class="statisticsValue"></td>
+        </tr>
+        <tr>
+            <td>QBT_TR(Session waste:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="TotalWastedSession" class="statisticsValue"></td>
+        </tr>
+        <tr>
+            <td>QBT_TR(Connected peers:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="TotalPeerConnections" class="statisticsValue"></td>
+        </tr>
+    </table>
+    <h3>QBT_TR(Cache statistics)QBT_TR[CONTEXT=StatsDialog]</h3>
+    <table style="width:100%">
+        <tr>
+            <td>QBT_TR(Read cache hits:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="ReadCacheHits" class="statisticsValue"></td>
+        </tr>
+        <tr>
+            <td>QBT_TR(Total buffer size:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="TotalBuffersSize" class="statisticsValue"></td>
+        </tr>
+    </table>
+    <h3>QBT_TR(Performance statistics)QBT_TR[CONTEXT=StatsDialog]</h3>
+    <table style="width:100%">
+        <tr>
+            <td>QBT_TR(Write cache overload:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="WriteCacheOverload" class="statisticsValue"></td>
+        </tr>
+        <tr>
+            <td>QBT_TR(Read cache overload:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="ReadCacheOverload" class="statisticsValue"></td>
+        </tr>
+        <tr>
+            <td>QBT_TR(Queued I/O jobs:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="QueuedIOJobs" class="statisticsValue"></td>
+        </tr>
+        <tr>
+            <td>QBT_TR(Average time in queue:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="AverageTimeInQueue" class="statisticsValue"></td>
+        </tr>
+        <tr>
+            <td>QBT_TR(Total queued size:)QBT_TR[CONTEXT=StatsDialog]</td>
+            <td id="TotalQueuedSize" class="statisticsValue"></td>
+        </tr>
+    </table>
+</div>