From 98570d3547c598b9161bd2cb359964f88b065569 Mon Sep 17 00:00:00 2001
From: Algorithm5838 <108630393+Algorithm5838@users.noreply.github.com>
Date: Wed, 1 Apr 2026 02:42:52 +0300
Subject: [PATCH] perf: single yield per line in stream chunks handler (#23266)

---
 backend/open_webui/utils/misc.py | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/backend/open_webui/utils/misc.py b/backend/open_webui/utils/misc.py
index bfa934c8b..787ef4d6e 100644
--- a/backend/open_webui/utils/misc.py
+++ b/backend/open_webui/utils/misc.py
@@ -961,18 +961,15 @@ def stream_chunks_handler(stream: aiohttp.StreamReader):
                         skip_mode = False
                         yield line
                     else:
-                        yield b'data: {}'
-                        yield b'\n'
+                        yield b'data: {}\n'
                 else:
                     # Normal mode: check if line exceeds limit
                     if len(line) > max_buffer_size:
                         skip_mode = True
-                        yield b'data: {}'
-                        yield b'\n'
+                        yield b'data: {}\n'
                         log.info(f'Skip mode triggered, line size: {len(line)}')
                     else:
-                        yield line
-                        yield b'\n'
+                        yield line + b'\n'
 
             # Save the last incomplete fragment
             buffer = lines[-1]
@@ -986,7 +983,6 @@ def stream_chunks_handler(stream: aiohttp.StreamReader):
 
         # Process remaining buffer data
         if buffer and not skip_mode:
-            yield buffer
-            yield b'\n'
+            yield buffer + b'\n'
 
     return yield_safe_stream_chunks()