Backendless Notification and performance issue

Hello we have developed Ios app and used backendless as back-end support. We are facing some issues with performance with backendless. Notification is very slow and updating table inserting,updating values in table is very slow. That causes major problems on App performance. We have changed database structure and applied relationships between tables to minimise the request calls to backendless.

  plz provide any solution to overcome the notifications and performance issue.Is there any package we need to buy for these.