NextCloud is getting Slow in sometimes

I am using nextcloud API in my website. I try to use it quite effectively with login, file upload, delete etc.

Sometimes NextCloud is really getting slow. Not even login response in 14 seconds. It returns to normal after a certain time.
What could be the reason for this? Lastly, I added my IP address to the whitelist. Would this be a solution? Is nextCloud intentionally slowing down for security?

Thanks for reply

There is a bruteforce app that can slow down things, but there are options to whitelist.

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