change your mouse polling rate from 1000 to 400&500,
disable in game origin settings - origin-app set-more tab-in game-disable it and(right click on the game-game prop-uncheck in game,
disable any geforce experience overlay settings,
update graphic card
disable sound enhancement
and some edit in registry and nvidia control panel
Apex Legends Fps Boost Setings (follow steps in this link)
https://www.youtube.com/watch?v=YpRPOVUBvlk
i did all of it and my fps increase from 50 to 80+ and no stuttering lag fps drop etc again
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