There are frequent re-renders happening and the expected outcomes are not being achieved. Issues may be related to the use of useEffect, useState, localStorage, or syncfusion.

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To troubleshoot frequent re-renders and unexpected outcomes, follow these steps:

1. Check your useEffect hooks to make sure they are being used correctly. useEffect should only be used to manage side effects, such as fetching data or updating the DOM. If useEffect is being used to update state, it may be causing unnecessary re-renders.
2. Check your useState hooks to make sure they are being updated correctly. If you are updating state in a way that causes the component to re-render, you may be creating a loop.
3. Check your localStorage usage to make sure you are using it correctly. If you are storing too much data in localStorage or accessing it too frequently, it may be causing performance issues.
4. Check your syncfusion usage to make sure you are using it correctly. If you are not using it in a way that is optimized for performance or if there are bugs in the syncfusion library, it may be causing issues.

By following these steps, you can pinpoint the root cause of the issues and make the necessary changes to improve performance and achieve the expected outcomes.