1 file changed, 3 insertions, 1 deletion
diff --git a/source/shared.c b/source/shared.c
index 51c92d4..0bd9fe3 100644
--- a/source/shared.c
+++ b/source/shared.c
@@ -435,7 +435,9 @@ int cgit_diff_files(const struct object_id *old_oid, const struct object_id *new
 	memset(&diff_params, 0, sizeof(diff_params));
 	memset(&emit_params, 0, sizeof(emit_params));
 	memset(&emit_cb, 0, sizeof(emit_cb));
-	diff_params.flags = XDF_NEED_MINIMAL;
+	// Without XDF_NEED_MINIMAL, as git diffs by default: on a file whose
+	// lines were reordered, a minimal diff costs time quadratic in its
+	// length.
 	if (ignorews)
 		diff_params.flags |= XDF_IGNORE_WHITESPACE;
 	emit_params.ctxlen = context > 0 ? context : DEFAULT_DIFF_CONTEXT;