diff --git a/web/app.js b/web/app.js
index 8c06794..93a1f29 100644
--- a/web/app.js
+++ b/web/app.js
@@ -264,6 +264,7 @@ function renderMessage(msg) {
 }
 
 function addMessage(role, text) {
+    clearPartials();
     const msg = { role, text, ts: Date.now() };
     history.push(msg);
     persistHistory();
@@ -335,7 +336,8 @@ function registerTranscriptionStream(rm) {
                     if (pub) { role = isAgent(p) ? "agent" : "user"; break; }
                 }
             }
-            addMessage(role, text.trim());
+            // Use partial rendering: updates the same row in place until final.
+            addPartial(role, text.trim());
         });
     } catch (e) {
         // Older SDKs may not support registerTextStreamHandler — the data