diff --git a/ui/src/components/ProcessDiagram/DiagramNode.tsx b/ui/src/components/ProcessDiagram/DiagramNode.tsx
index 7539677f..bc8d6ece 100644
--- a/ui/src/components/ProcessDiagram/DiagramNode.tsx
+++ b/ui/src/components/ProcessDiagram/DiagramNode.tsx
@@ -102,6 +102,18 @@ export function DiagramNode({
       style={{ cursor: 'pointer' }}
       opacity={isSkipped ? 0.35 : undefined}
     >
+      {/* Processor metrics tooltip */}
+      {heatmapEntry && (
+        <title>{[
+          `${node.id}${heatmapEntry.processorType ? ` (${heatmapEntry.processorType})` : ''}`,
+          `Avg: ${heatmapEntry.avgDurationMs.toLocaleString(undefined, { maximumFractionDigits: 3 })}ms`,
+          `P99: ${heatmapEntry.p99DurationMs.toLocaleString(undefined, { maximumFractionDigits: 3 })}ms`,
+          `Time: ${heatmapEntry.pctOfRoute.toFixed(1)}%`,
+          heatmapEntry.totalCount != null ? `Invocations: ${heatmapEntry.totalCount.toLocaleString()}` : '',
+          heatmapEntry.errorRate != null ? `Errors: ${(heatmapEntry.errorRate * 100).toFixed(2)}%` : '',
+        ].filter(Boolean).join('\n')}</title>
+      )}
+
       {/* Selection ring */}
       {isSelected && (
         <rect
diff --git a/ui/src/components/ProcessDiagram/types.ts b/ui/src/components/ProcessDiagram/types.ts
index 69bc8fcd..5be2c9f1 100644
--- a/ui/src/components/ProcessDiagram/types.ts
+++ b/ui/src/components/ProcessDiagram/types.ts
@@ -21,6 +21,10 @@ export interface LatencyHeatmapEntry {
   p99DurationMs: number;
   /** Percentage of total route time this processor consumes (0-100) */
   pctOfRoute: number;
+  /** Additional fields for diagram tooltip (optional — populated by dashboard) */
+  processorType?: string;
+  totalCount?: number;
+  errorRate?: number;
 }
 
 export interface ProcessDiagramProps {
diff --git a/ui/src/pages/DashboardTab/DashboardL3.tsx b/ui/src/pages/DashboardTab/DashboardL3.tsx
index 139d2909..8af26a58 100644
--- a/ui/src/pages/DashboardTab/DashboardL3.tsx
+++ b/ui/src/pages/DashboardTab/DashboardL3.tsx
@@ -1,4 +1,4 @@
-import { useMemo } from 'react';
+import { useMemo, useState } from 'react';
 import { useParams } from 'react-router';
 import {
   KpiStrip,
@@ -247,6 +247,7 @@ function buildKpiItems(
 // ── Component ───────────────────────────────────────────────────────────────
 
 export default function DashboardL3() {
+  const [processorView, setProcessorView] = useState<'diagram' | 'table'>('diagram');
   const { appId, routeId } = useParams<{ appId: string; routeId: string }>();
   const selectedEnv = useEnvironmentStore((s) => s.environment);
   const { timeRange } = useGlobalFilters();
@@ -290,8 +291,8 @@ export default function DashboardL3() {
 
   // ── Chart data ───────────────────────────────────────────────────────────
   const chartData = useMemo(() =>
-    (timeseries?.buckets || []).map((b: any, i: number) => ({
-      idx: i,
+    (timeseries?.buckets || []).map((b: any) => ({
+      time: b.time,
       throughput: b.totalCount,
       p99: b.p99DurationMs,
       errorRate: b.totalCount > 0 ? (b.failedCount / b.totalCount) * 100 : 0,
@@ -299,6 +300,9 @@ export default function DashboardL3() {
     [timeseries],
   );
 
+  const formatTime = (t: string) =>
+    new Date(t).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
+
   // ── Processor table rows ────────────────────────────────────────────────
   const processorRows: ProcessorRow[] = useMemo(() => {
     if (!processorMetrics?.length) return [];
@@ -321,12 +325,15 @@ export default function DashboardL3() {
     const totalAvg = processorMetrics.reduce(
       (sum: number, m: any) => sum + m.avgDurationMs, 0,
     );
-    const map = new Map<string, { avgDurationMs: number; p99DurationMs: number; pctOfRoute: number }>();
+    const map = new Map<string, { avgDurationMs: number; p99DurationMs: number; pctOfRoute: number; processorType?: string; totalCount?: number; errorRate?: number }>();
     for (const m of processorMetrics) {
       map.set(m.processorId, {
         avgDurationMs: m.avgDurationMs,
         p99DurationMs: m.p99DurationMs,
         pctOfRoute: totalAvg > 0 ? (m.avgDurationMs / totalAvg) * 100 : 0,
+        processorType: m.processorType,
+        totalCount: m.totalCount,
+        errorRate: m.errorRate,
       });
     }
     return map;
@@ -352,14 +359,14 @@ export default function DashboardL3() {
       {(timeseries?.buckets?.length ?? 0) > 0 && (
         <div className={styles.chartRow}>
           <Card title="Throughput">
-            <ThemedChart data={chartData} height={200} xDataKey="idx" yLabel="msg/s">
+            <ThemedChart data={chartData} height={200} xDataKey="time" xTickFormatter={formatTime} yLabel="msg/s">
               <Area dataKey="throughput" name="Throughput" stroke={CHART_COLORS[0]}
                 fill={CHART_COLORS[0]} fillOpacity={0.1} strokeWidth={2} dot={false} />
             </ThemedChart>
           </Card>
 
           <Card title="Latency Percentiles">
-            <ThemedChart data={chartData} height={200} xDataKey="idx" yLabel="ms">
+            <ThemedChart data={chartData} height={200} xDataKey="time" xTickFormatter={formatTime} yLabel="ms">
               <Line dataKey="p99" name="P99" stroke={CHART_COLORS[0]} strokeWidth={2} dot={false} />
               <ReferenceLine y={slaThresholdMs} stroke="var(--error)" strokeDasharray="5 3"
                 label={{ value: `SLA ${slaThresholdMs}ms`, position: 'right', fill: 'var(--error)', fontSize: 9 }} />
@@ -367,7 +374,7 @@ export default function DashboardL3() {
           </Card>
 
           <Card title="Error Rate">
-            <ThemedChart data={chartData} height={200} xDataKey="idx" yLabel="%">
+            <ThemedChart data={chartData} height={200} xDataKey="time" xTickFormatter={formatTime} yLabel="%">
               <Area dataKey="errorRate" name="Error Rate" stroke={CHART_COLORS[1]}
                 fill={CHART_COLORS[1]} fillOpacity={0.1} strokeWidth={2} dot={false} />
             </ThemedChart>
@@ -375,33 +382,42 @@ export default function DashboardL3() {
         </div>
       )}
 
-      {/* Process Diagram with Latency Heatmap */}
-      {appId && routeId && (
-        <div className={`${tableStyles.tableSection} ${styles.diagramHeight}`}>
-          <ProcessDiagram
-            application={appId}
-            routeId={routeId}
-            diagramLayout={diagramLayout}
-            latencyHeatmap={latencyHeatmap}
-          />
-        </div>
-      )}
-
-      {/* Processor Metrics Table */}
+      {/* Processor Metrics — toggle between diagram and table */}
       <div className={tableStyles.tableSection}>
         <div className={tableStyles.tableHeader}>
           <span className={tableStyles.tableTitle}>Processor Metrics</span>
-          <div>
+          <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
             <span className={tableStyles.tableMeta}>
               {processorRows.length} processor{processorRows.length !== 1 ? 's' : ''}
             </span>
+            <div className={styles.toggleRow}>
+              <button
+                className={`${styles.toggleBtn} ${processorView === 'diagram' ? styles.toggleActive : ''}`}
+                onClick={() => setProcessorView('diagram')}
+              >Diagram</button>
+              <button
+                className={`${styles.toggleBtn} ${processorView === 'table' ? styles.toggleActive : ''}`}
+                onClick={() => setProcessorView('table')}
+              >Table</button>
+            </div>
           </div>
         </div>
-        <DataTable
-          columns={PROCESSOR_COLUMNS}
-          data={processorRows}
-          sortable
-        />
+        {processorView === 'diagram' && appId && routeId ? (
+          <div className={styles.diagramHeight}>
+            <ProcessDiagram
+              application={appId}
+              routeId={routeId}
+              diagramLayout={diagramLayout}
+              latencyHeatmap={latencyHeatmap}
+            />
+          </div>
+        ) : (
+          <DataTable
+            columns={PROCESSOR_COLUMNS}
+            data={processorRows}
+            sortable
+          />
+        )}
       </div>
 
       {/* Top 5 Errors — hidden if empty */}
diff --git a/ui/src/utils/format-utils.ts b/ui/src/utils/format-utils.ts
index d05d5172..8e7a5a84 100644
--- a/ui/src/utils/format-utils.ts
+++ b/ui/src/utils/format-utils.ts
@@ -15,8 +15,8 @@ export function formatDurationShort(ms: number | undefined): string {
     const seconds = Math.round((ms % 60_000) / 1000);
     return seconds > 0 ? `${minutes}m ${seconds}s` : `${minutes}m`;
   }
-  if (ms >= 1000) return `${(ms / 1000).toFixed(1)}s`;
-  return `${ms}ms`;
+  if (ms >= 1000) return `${(ms / 1000).toLocaleString(undefined, { maximumFractionDigits: 1 })}s`;
+  return `${ms.toLocaleString(undefined, { maximumFractionDigits: 3 })}ms`;
 }
 
 export function statusLabel(s: string): string {