diff --git a/public/js/app.js b/public/js/app.js
index aa45588..1c2fbdc 100644
--- a/public/js/app.js
+++ b/public/js/app.js
@@ -1340,7 +1340,6 @@
     const cpuValueHtml = `
         <div style="display: flex; align-items: baseline; gap: 8px;">
             <span style="font-weight: 700; font-size: 1.1rem;">${formatPercent(data.cpuBusy)}</span>
-            <span style="font-size: 0.7rem; color: var(--text-secondary); font-weight: normal;">(IO Wait: ${data.cpuIowait.toFixed(1)}%, Busy Others: ${data.cpuOther.toFixed(1)}%)</span>
         </div>
     `;
     // Define metrics to show
diff --git a/server/prometheus-service.js b/server/prometheus-service.js
index c348788..3ff45e3 100644
--- a/server/prometheus-service.js
+++ b/server/prometheus-service.js
@@ -549,14 +549,6 @@ async function getServerDetails(baseUrl, instance, job) {
   
   // Queries based on the requested dashboard structure
   const queries = {
-    // Split CPU
-    cpuSystem: `avg(rate(node_cpu_seconds_total{mode="system", instance="${node}"}[1m])) * 100`,
-    cpuUser: `avg(rate(node_cpu_seconds_total{mode="user", instance="${node}"}[1m])) * 100`,
-    cpuIowait: `avg(rate(node_cpu_seconds_total{mode="iowait", instance="${node}"}[1m])) * 100`,
-    cpuIrq: `avg(rate(node_cpu_seconds_total{mode=~"irq|softirq", instance="${node}"}[1m])) * 100`,
-    cpuOther: `avg(rate(node_cpu_seconds_total{mode=~"nice|steal|guest|guest_nice", instance="${node}"}[1m])) * 100`,
-    cpuIdle: `avg(rate(node_cpu_seconds_total{mode="idle", instance="${node}"}[1m])) * 100`,
-    
     cpuBusy: `100 * (1 - avg(rate(node_cpu_seconds_total{mode="idle", instance="${node}"}[1m])))`,
     sysLoad: `node_load1{instance="${node}",job="${job}"} * 100 / count(count(node_cpu_seconds_total{instance="${node}",job="${job}"}) by (cpu))`,
     memUsedPct: `(1 - (node_memory_MemAvailable_bytes{instance="${node}", job="${job}"} / node_memory_MemTotal_bytes{instance="${node}", job="${job}"})) * 100`,
@@ -636,42 +628,18 @@ async function getServerHistory(baseUrl, instance, job, metric, range = '1h', st
   const url = normalizeUrl(baseUrl);
   const node = resolveToken(instance);
   
-  // Custom multi-metric handler for CPU Busy
+  // CPU Busy history: 100 - idle
   if (metric === 'cpuBusy') {
-      const modes = {
-          system: 'system',
-          user: 'user',
-          iowait: 'iowait',
-          irq: 'irq|softirq',
-          other: 'nice|steal|guest|guest_nice',
-          idle: 'idle'
-      };
-
+      const expr = `100 * (1 - avg(rate(node_cpu_seconds_total{mode="idle", instance="${node}"}[1m])))`;
       const rangeObj = parseRange(range, start, end);
-      const timestamps = [];
-      const series = {};
-      Object.keys(modes).forEach(m => series[m] = []);
-
-      const results = await Promise.all(Object.entries(modes).map(async ([name, mode]) => {
-          const expr = `avg(rate(node_cpu_seconds_total{mode=~"${mode}", instance="${node}"}[1m])) * 100`;
-          const res = await queryRange(url, expr, rangeObj.queryStart, rangeObj.queryEnd, rangeObj.step);
-          return { name, values: res.length > 0 ? res[0].values : [] };
-      }));
-
-      if (results[0].values.length === 0) return { timestamps: [], series: {} };
-
-      // Use first result for timestamps
-      results[0].values.forEach(v => timestamps.push(v[0] * 1000));
+      const result = await queryRange(url, expr, rangeObj.queryStart, rangeObj.queryEnd, rangeObj.step);
       
-      results.forEach(r => {
-          r.values.forEach(v => series[r.name].push(parseFloat(v[1])));
-      });
-
-      // Pre-calculate busy percentage: 100 - idle
-      const idleValues = series.idle || [];
-      const busyValues = idleValues.map(idleVal => Math.max(0, 100 - idleVal));
-
-      return { timestamps, series, values: busyValues };
+      if (!result || result.length === 0) return { timestamps: [], values: [] };
+      
+      return {
+          timestamps: result[0].values.map(v => v[0] * 1000),
+          values: result[0].values.map(v => parseFloat(v[1]))
+      };
   }
 
   // Map metric keys to Prometheus expressions