Here are some ways to decrease it....
Here was some ways that I can think of from the top of my head to decrease the lag.
If you can think of more, feel free to share below.
- Turn off the weather. That is a cause of lag (the particles the weather does...) mostly client related, but could also put some strain on the "server" too.
- Clear any loose items around (Like clearlagg command, use /kill @e[type=item] to kill off any items that are on the floor. /kill @e[type=!player] will kill off all mobs, items and other entities appart from player).
- Decrease the amount of redstone clocks on the server. The less the better
Here was some ways that I can think of from the top of my head to decrease the lag.
If you can think of more, feel free to share below.