[MC-168040] High idle CPU usage on servers compared to earlier versions

When migrating from 1.13 to 1.14, the Java Minecraft server saw significant performance decreases. I was hoping 1.15 would see improvements back to what 1.13 was like, but that doesn't seem to be the case.

I ran a test by switching my server from 1.14 to 1.15, then 1.13 to show the relative differences in performance. Attached is the CPU usage chart from the Linode instance I use to run the server. The sections labeled 1.15 and 1.13 are brand new worlds with no players logged in.

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violine1101 2019-12-15T11:49:10Z

Please provide more details, otherwise we don't have enough info to investigate this. Just "server performance is worse than before" is not a valid bug report.

Hayden Muhl 2019-12-15T11:52:09Z

I provided a chart showing CPU usage while the server is idle. What kind of information do you need?

violine1101 2019-12-16T23:42:06Z

Any kind of indication for what might cause worse performance.

Yes, we know that there is lag, but if people don't tell us where it comes from, performance can't be improved.