diff --git a/src/components/httprequestviewer/lib/httpRequestProcessor.ts b/src/components/httprequestviewer/lib/httpRequestProcessor.ts
index a90768b..69ea4ab 100644
--- a/src/components/httprequestviewer/lib/httpRequestProcessor.ts
+++ b/src/components/httprequestviewer/lib/httpRequestProcessor.ts
@@ -156,7 +156,11 @@ export const calculateDurations = (request: HTTPRequest): void => {
   }
   
   // Calculate Total Response Time (wall clock time from request initiation to completion)
-  if (request.events.sendRequest && lastDataTimestamp) {
+  // Use the earliest request start time (timing.start) which includes queuing, not sendRequest.ts
+  if (request.timing.start && lastDataTimestamp) {
+    request.timing.totalResponseTime = lastDataTimestamp - request.timing.start
+  } else if (request.events.sendRequest && lastDataTimestamp) {
+    // Fallback to sendRequest timestamp if timing.start unavailable
     request.timing.totalResponseTime = lastDataTimestamp - request.events.sendRequest.ts
   } else if (request.timing.queueTime && request.timing.duration) {
     // Fallback: sum all known components