Server running low TPS?
If your server is running low TPS, there can be many reasons for this:
Minecraft
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Your Server View Distance and Simulation Distance are too high - try lowering them both to 10 or even 6 to reduce low tps
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If you are running a modded server, one of your mods may be running a function every tick, this causes unwanted stress on your server, to diagnose which mod this could be, install the mod "Spark" onto your server, and run a spark profiler for 60 seconds
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Too many plugins, Mods or Players for your plan. If you are running 100 plugins with 100 players on a 2GB Server for example, your server is bound to lag or even crash!