Problem/Bug [NEED HELP] Minecraft TNT Cannon ~ 400 Dispensers laggs the server

Hey man I got a problem, I bought a minecraft server with 1gb ram. Installed clearlag,worldedit,worldguard,essentials and groupmanager now the problem is when I want to launch bigger cannons ~ 90-200 stackers the tnt laggs. Do I need more ram? or a plugin?

 

Does it lag the server or the client? How do you know it's lagging the server? And how much is it lagging the server?

 

Its lagging the server and a lot so nothing can be placed during the tnt is exploding.
Can't keep up did the system time change or is the server overloaded.... skipping... ticks

 

Do the command /gc a few times immediately after this happens and see what it says for TPS.

I have a feeling you won't be able to do a lot about it. You're asking for an awful lot of calculations to be done at once.