Why am I getting 28 fps in the middle of the fight?

I have I5 7760K and 1050 geforce, 24 gb RAM, using 144 hz monitor (asus) and some corsair stuff as headset, keyboard, mouse and electronic steelseries mousepad I've had this computer for 1 year so it's not even old lol Additions, it's normally running at 144 fps when I am not in a middle of a fight but in recent times, I am having this horrible experience
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