Also turn off DoT damage messages. Basically, turn off/lower/reduce anything and everything you can. /hidecorpse can also be your friend if you don't care about loot.
But yes, P.o.S. computers will require this more than up-to-date machines. But at some point it becomes less of a computer problem and more of a client-server interaction problem. I don't have any network advice to improve that if your computer is not what is holding you back.
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