Optimize Your Server
After reading Find the Cause of Lag, you're probably wondering how to optimize your server. Don't worry because in this article, you'll learn how to do it.
YouHaveTrouble - minecraft-optimization
I highly recommend reading YouHaveTrouble's guide on server optimization because it covers several important topics and settings that you can apply.
Caution
Since every Minecraft server is different, I strongly recommend not copying the settings from YouHaveTrouble's guide but rather carefully reading how each setting changes and affects your server!