Why my react-admin coasts more than 99% of CPU? - react-admin

I am new to Reactjs.
I have implemented admin with react-admin, and it coasts more than 99% of CPU and after a while it stops working.
I assume that I made a mistake somewhere but I can not find a way to optimize the performance.
Could anyone advise me to improve this?
I am not sure which code snippet i have to share with you.
Thanks in advance

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