diff --git a/src/components/httprequestviewer/lib/csvExport.ts b/src/components/httprequestviewer/lib/csvExport.ts
index d5fd0dd..0e6134f 100644
--- a/src/components/httprequestviewer/lib/csvExport.ts
+++ b/src/components/httprequestviewer/lib/csvExport.ts
@@ -14,14 +14,14 @@ const DEFAULT_COLUMNS = [
   'priority',
   'protocol',
   'connectionNumber',
-  'requestNumber',
-  'startTime',
-  'queueTime',
+  'requestNumberOnConnection',
+  'timing.start',
+  'timing.queueTime',
   'dnsTime',
   'connectionTime',
-  'serverLatency',
-  'duration',
-  'totalResponseTime',
+  'timing.serverLatency',
+  'timing.duration',
+  'timing.totalResponseTime',
   'dataRate',
   'size',
   'contentLength',
@@ -55,6 +55,34 @@ const formatCSVValue = (value: any): string => {
   return stringValue
 }
 
+// Calculate derived values for CSV export
+const calculateDerivedValue = (request: HTTPRequest, path: string): any => {
+  switch (path) {
+    case 'dnsTime':
+      if (request.timing.dnsStart !== undefined && request.timing.dnsEnd !== undefined && 
+          request.timing.dnsStart >= 0 && request.timing.dnsEnd >= 0) {
+        return request.timing.dnsEnd - request.timing.dnsStart
+      }
+      return null
+    case 'connectionTime':
+      if (request.timing.connectStart !== undefined && request.timing.connectEnd !== undefined && 
+          request.timing.connectStart >= 0 && request.timing.connectEnd >= 0) {
+        return request.timing.connectEnd - request.timing.connectStart
+      }
+      return null
+    case 'dataRate':
+      if (!request.timing.duration || request.timing.duration <= 0) return null
+      const bytes = request.contentLength && request.contentLength > 0 ? request.contentLength : request.encodedDataLength
+      if (!bytes) return null
+      const durationSeconds = request.timing.duration / 1000000
+      return bytes / durationSeconds // bytes per second
+    case 'size':
+      return request.encodedDataLength || request.contentLength || null
+    default:
+      return getNestedValue(request, path)
+  }
+}
+
 // Get nested property value from object
 const getNestedValue = (obj: any, path: string): any => {
   return path.split('.').reduce((current, key) => {
@@ -81,12 +109,40 @@ export const exportRequestsToCSV = (
   // Add headers if requested
   if (includeHeaders) {
     const headers = selectedColumns.map(col => {
-      // Clean up column names for headers
-      return col
-        .replace(/([A-Z])/g, ' $1') // Add space before capitals
-        .replace(/^\w/, c => c.toUpperCase()) // Capitalize first letter
-        .replace(/\./g, ' ') // Replace dots with spaces
-        .trim()
+      // Add units to timing-related headers
+      switch (col) {
+        case 'timing.start':
+          return 'Start Time (μs)'
+        case 'timing.queueTime':
+          return 'Queue Time (μs)'
+        case 'dnsTime':
+          return 'DNS Time (μs)'
+        case 'connectionTime':
+          return 'Connection Time (μs)'
+        case 'timing.serverLatency':
+          return 'Server Latency (μs)'
+        case 'timing.duration':
+          return 'Duration (μs)'
+        case 'timing.totalResponseTime':
+          return 'Total Response Time (μs)'
+        case 'timing.downloadTime':
+          return 'Download Time (μs)'
+        case 'dataRate':
+          return 'Data Rate (bytes/sec)'
+        case 'size':
+          return 'Size (bytes)'
+        case 'contentLength':
+          return 'Content Length (bytes)'
+        case 'encodedDataLength':
+          return 'Encoded Data Length (bytes)'
+        default:
+          // Clean up column names for other headers
+          return col
+            .replace(/([A-Z])/g, ' $1') // Add space before capitals
+            .replace(/^\w/, c => c.toUpperCase()) // Capitalize first letter
+            .replace(/\./g, ' ') // Replace dots with spaces
+            .trim()
+      }
     })
     lines.push(headers.map(formatCSVValue).join(','))
   }
@@ -94,7 +150,7 @@ export const exportRequestsToCSV = (
   // Add data rows
   for (const request of requests) {
     const values = selectedColumns.map(column => {
-      const value = getNestedValue(request, column)
+      const value = calculateDerivedValue(request, column)
       return formatCSVValue(value)
     })
     lines.push(values.join(','))