By how much would I need to suddenly increase Earth's gravity to give an extinction-level event?

Some percentage of the more common elements of Earth's bulk (silicon, iron, and so on) are replaced with something much heavier. This changes the over mass of Earth and its gravity increases according.

How much of a change to gravity would it take to cause an extinction level event for the higher lifeforms? In other words, no need to worry about microorganisms as they may not notice.

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By how much would I need to suddenly increase Earth's gravity to give an extinction-level event?

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