Update batch-update.md

Author: JonathanMagnan

docs2/pages/documentations/batch-update.md

@@ -99,6 +99,17 @@ ctx.Users.Where(x => x.LastLoginDate < date)
  - **DO NOT** support TPT
 
   If you need to use one of this feature, you need to use the library [Entity Framework Extensions](https://entityframework-extensions.net/)
+  
+ ### EF Core & Client Evaluation
+ 
+  _Do not use this feature if Client Evaluation is enabled_
+  
+`Batch Update` use the SQL generated by EF Core. When a filter is made on client-side, it means the filtering happens in the application and not in the SQL executed.
+
+In other words, even if you put a filter, all rows tables could be potentially updated if the filter is made on the client-side.
+
+We always recommend to [disable the client evaluation](https://docs.microsoft.com/en-us/ef/core/querying/client-eval#optional-behavior-throw-an-exception-for-client-evaluation) to avoid performance issue in your application.
+
 
 ## Requirements