The UI should be the last thing thats slow, relatively speaking. Database could be slow, network could have some issues, the backend code could be inefficient a

The UI should be the last thing thats slow, relatively speaking. Database could be slow, network could have some issues, the backend code could be inefficient and so on. But if the UI is objectively slow, discounting above things, then that should be addressed asap. Because if that continues to be the issue, it doesn't matter how much quick the backend/database is - user just won't see the performance behind the scenes.