Why is there a limit in bookmarking?

So I really need to bookmark a lot of replies for a little project I am doing, but after a a number of bookmarks there says that I need to wait a period of time, sometimes in hours, until I can bookmark again.
My question is simple: why is there a limit in bookmarking?

It’s probably to prevent lag on the boards or something like that. I don’t know for sure if that’s correct though.

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