diff --git a/jedi/inference/dynamic_params.py b/jedi/inference/dynamic_params.py
index 9c4d2fd9..3e9477f3 100644
--- a/jedi/inference/dynamic_params.py
+++ b/jedi/inference/dynamic_params.py
@@ -121,7 +121,7 @@ def _search_function_arguments(module_context, funcdef, string_name):
         module_contexts = get_module_contexts_containing_name(
             inference_state, [module_context], string_name,
             # Limit the amounts of files to be opened massively.
-            limit_reduction=10,
+            limit_reduction=5,
         )
     else:
         module_contexts = [module_context]
diff --git a/jedi/inference/references.py b/jedi/inference/references.py
index cb83fb22..e78689ff 100644
--- a/jedi/inference/references.py
+++ b/jedi/inference/references.py
@@ -18,7 +18,7 @@ With os.walk, it takes about 10s to scan 11'000 files (without filesystem
 caching). Once cached it only takes 5s. So it is expected that reading all
 those files might take a few seconds, but not a lot more.
 """
-_PARSED_FILE_LIMIT = 50
+_PARSED_FILE_LIMIT = 30
 """
 For now we keep the amount of parsed files really low, since parsing might take
 easily 100ms for bigger files.