put in a warning about refresh

docs/api_classes/meta.md

@@ -5,6 +5,9 @@
 
 ::: sageworks.api.meta
 
+## Important
+Many of the methods below have a `refresh` argument that's defaulted to False. In almost every situation and use case this is the correct default. Setting `refresh` to `True` will lead to fairly substantial performance issues, so don't do it :).
+
 
 ## Examples
 These example show how to use the `Meta()` class to pull lists of artifacts from AWS. DataSources, FeatureSets, Models, Endpoints and more. If you're building a web interface plugin, the **Meta** class is a great place to start.
@@ -131,4 +134,4 @@ dict_keys(['EndpointName', 'EndpointArn', 'EndpointConfigName', 'ProductionVaria
 
 
 !!! note "Not Finding some particular AWS Data?"
-    The SageWorks Meta API Class also has `_details()` methods, so make sure to check those out.
+    The SageWorks Meta API Class also has `_details()` methods, so make sure to check those out.