diff --git a/plugins/sentinel/dashboard.html b/plugins/sentinel/dashboard.html
index 395575d..87aa53b 100644
--- a/plugins/sentinel/dashboard.html
+++ b/plugins/sentinel/dashboard.html
@@ -223,6 +223,11 @@
         var body = card.querySelector('.metrics-body');
         if (!body) return;
 
+        var oldCpu = parseFloat(body.getAttribute('data-cpu')||(sys.cpu||{}).percent||0);
+        var oldMem = parseFloat(body.getAttribute('data-mem')||(sys.memory||{}).percent||0);
+        body.setAttribute('data-cpu', (sys.cpu||{}).percent||0);
+        body.setAttribute('data-mem', (sys.memory||{}).percent||0);
+
         if (isRow) {
           body.querySelector('.net-down').textContent = fmtSpeed(net.rx_bytes_sec||0);
           body.querySelector('.net-up').textContent = fmtSpeed(net.tx_bytes_sec||0);