default batch parallelism to 10

Author: cosmicexplorer

src/pip/_internal/cli/cmdoptions.py

@@ -237,7 +237,7 @@ class PipOption(Option):
     "--batch-download-parallelism",
     dest="batch_download_parallelism",
     type="int",
-    default=1,
+    default=10,
     help=(
         "Maximum parallelism employed for batch downloading of metadata-only dists"
         " (default %default parallel requests)."