Why did changing my name cause me to lag on multiplayer servers?

Yesterday I changed my name in Minecraft. When I went back on I was experiencing serious lag that I haven't had before. Such as when I log into my favorite server Mineplex I lag for minutes and every 5 or so minutes I have major lag spikes.
What can I do to fix this?
Best Answer
Name changes won't cause lag. If anything, the server is running slow or it's not your computer's best day.
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Answer 2
Mineplex is naturally laggy without Optifine, changing your name didn't make a difference. Try installing Optifine from here and get the latest version. Mess around with your video settings making sure everything is on "fastest." This should help lots.
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