I'm hosting a Minecraft server on a PC with 4GB RAM and an Intel Core i3, but it's lagging with 3+ players. How can I optimize it? Should I adjust Java arguments, tweak server.properties, or switch to PaperMC? Any tips to reduce mob/entity lag?

Such optimizing tips are on the web ready for those that look. And I've heard such even with high end hardware like the i9, 64GB RAM and SSDs so lag will always be with you. As to your server, it is what it is. Enjoy it till you can get a better one. Also consider trying a lightweight Linux OS.

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