diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index 65b72e026..de7ee2160 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -3298,7 +3298,7 @@ class YoutubeDL:
             else:
                 try:
                     self.to_screen('[info] Writing video annotations to: ' + annofn)
-                    with open(annofn, 'w', encoding='utf-8') as annofile:
+                    with open(annofn, 'w', encoding='utf-8', buffering=65536) as annofile:
                         annofile.write(info_dict['annotations'])
                 except (KeyError, TypeError):
                     self.report_warning('There are no annotations to write.')
@@ -4336,7 +4336,7 @@ class YoutubeDL:
                 try:
                     # Use newline='' to prevent conversion of newline characters
                     # See https://github.com/ytdl-org/youtube-dl/issues/10268
-                    with open(sub_filename, 'w', encoding='utf-8', newline='') as subfile:
+                    with open(sub_filename, 'w', encoding='utf-8', newline='', buffering=65536) as subfile:
                         subfile.write(sub_info['data'])
                     sub_info['filepath'] = sub_filename
                     ret.append((sub_filename, sub_filename_final))
@@ -4399,7 +4399,7 @@ class YoutubeDL:
                 try:
                     uf = self.urlopen(Request(t['url'], headers=t.get('http_headers', {})))
                     self.to_screen(f'[info] Writing {thumb_display_id} to: {thumb_filename}')
-                    with open(thumb_filename, 'wb') as thumbf:
+                    with open(thumb_filename, 'wb', buffering=65536) as thumbf:
                         shutil.copyfileobj(uf, thumbf)
                     ret.append((thumb_filename, thumb_filename_final))
                     t['filepath'] = thumb_filename
diff --git a/yt_dlp/extractor/common.py b/yt_dlp/extractor/common.py
index 92ddad2b7..1b2c7d98d 100644
--- a/yt_dlp/extractor/common.py
+++ b/yt_dlp/extractor/common.py
@@ -1064,7 +1064,7 @@ class InfoExtractor:
                 data = self._create_request(url_or_request, data).data
             filename = self._request_dump_filename(urlh.url, video_id, data)
             self.to_screen(f'Saving request to {filename}')
-            with open(filename, 'wb') as outf:
+            with open(filename, 'wb', buffering=65536) as outf:
                 outf.write(webpage_bytes)
 
         content = self.__decode_webpage(webpage_bytes, encoding, urlh.headers)
diff --git a/yt_dlp/utils/_utils.py b/yt_dlp/utils/_utils.py
index 699bf1e7f..e376e6887 100644
--- a/yt_dlp/utils/_utils.py
+++ b/yt_dlp/utils/_utils.py
@@ -187,7 +187,7 @@ def write_json_file(obj, fn):
 
     tf = tempfile.NamedTemporaryFile(
         prefix=f'{os.path.basename(fn)}.', dir=os.path.dirname(fn),
-        suffix='.tmp', delete=False, mode='w', encoding='utf-8')
+        suffix='.tmp', delete=False, mode='w', encoding='utf-8', buffering=65536)
 
     try:
         with tf:
@@ -603,7 +603,7 @@ def sanitize_open(filename, open_mode):
                     raise LockingUnsupportedError
                 stream = locked_file(filename, open_mode, block=False).__enter__()
             except OSError:
-                stream = open(filename, open_mode)
+                stream = open(filename, open_mode, buffering=65536)
             return stream, filename
         except OSError as err:
             if attempt or err.errno in (errno.EACCES,):