[diffusion] feat: add performance mode server args (#24491)

python/sglang/utils.py

@@ -426,13 +426,16 @@ def download_and_cache_file(url: str, filename: Optional[str] = None):
     chunk_size = 1024  # Download in chunks of 1KB
 
     # Use tqdm to display the progress bar
-    with open(filename, "wb") as f, tqdm(
-        desc=filename,
-        total=total_size,
-        unit="B",
-        unit_scale=True,
-        unit_divisor=1024,
-    ) as bar:
+    with (
+        open(filename, "wb") as f,
+        tqdm(
+            desc=filename,
+            total=total_size,
+            unit="B",
+            unit_scale=True,
+            unit_divisor=1024,
+        ) as bar,
+    ):
         for chunk in response.iter_content(chunk_size=chunk_size):
             f.write(chunk)
             bar.update(len(chunk))