Minecraft server is consuming all the time like RAM?

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So I have a minecraft server and if I have the z. B. 4 GB to wise he spent 3GB and who I assign in 10 GB he consumes 6 GB and even at 20 GB it consumes 16 and the tps fluctuates. Starting with 4 players the server has a tps of 15. How can I improve this?

And my server has a high CPU usage but almost no RAM

System: Debian 9

Me

Do you have plugins on it? Or is it with mods? Which version? Bukkit, spigot or vanilla?

where did you host the server? What kind of cpu does the server have?

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So we hosted the server at zap and have 16 gb ram and an Intel Xeon E5-2650 v2. We have just made all pluins down (except the check) and the tps is also good just stop the ram utilization.

Gaming PC config? cu cutenimble