Um its a weird question, but i want to ask anyways. Please dont report! I really need an answer!

I was playing a lan minecraft server with a few friends and we were all lagging like crazy! We've tried some things to fix it but its still not working anyone have and tips to help u fix it?

I would love if you answer this asap with only a super helpful answer please and thank you!!!!!! I will delete any answers that are just for the points or that dont work or just really dumb answers (just FYI)