I'm gonna give you something that might help ( I say might because it might not work ) you can check the Timing Reports to see what's making the Server Lag. You can access the Timing Reports by executing the command "/timings on" and then "/timings paste" then look for the High Values on the page. What also may help is turning your Render Distance down ( In Minecraft Client-side) as a high Render Distance can cause Server lags/crashes I hope this helped you with what you needed. =)
@iiFinals We don't bully you, it's just you can't handle anything. Such as Jokes you take them personally and when we say the truth you consider it harassment and bullying but in reality, it's just the truth, and like I said you can't handle the truth now can you?
Really an unnecessary post :/