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Well, it works for everyone else.
Can you reliably reproduce the problem with just this script and no other scripts running? Can you reproduce it in a new profile with just Tampermonkey/Violentmonkey? Can you tell which pages did you try? What is your browser and its version? What is the version of Tampermonkey/Violentmonkey you're using?
Just lags my browser to a crawl, removed.