diff --git a/packages/ui/src/stores/session-actions.ts b/packages/ui/src/stores/session-actions.ts
index c95359a..24be1fc 100644
--- a/packages/ui/src/stores/session-actions.ts
+++ b/packages/ui/src/stores/session-actions.ts
@@ -449,7 +449,7 @@ async function readSseStream(
     if (idleTimer) clearTimeout(idleTimer)
     idleTimer = setTimeout(() => {
       timedOut = true
-      reader.cancel().catch(() => {})
+      reader.cancel().catch(() => { })
     }, idleTimeoutMs)
   }
   resetIdleTimer()
@@ -474,6 +474,8 @@ async function readSseStream(
         }
         onData(data)
       }
+      // Yield to main thread periodically to prevent UI freeze during rapid streaming
+      await new Promise<void>(resolve => setTimeout(resolve, 0))
     }
     if (timedOut) {
       throw new Error("Stream timed out")