Large server CPU increase in 1.14+

Since 1.14/1.15, CPU usage has increased by a very large amount. In 1.13, usage was around 5% with nobody online, but in 1.15+ an entire core is being used. I tested with a fresh instance on 1.13, 1.15 and 1.16 snapshot 20w06a with the vanilla server jar (1.14 not tested). Even with more cores and ram this is still an issue.

I have attached files showing the difference, at the start it maxes out (as expected) and then comes to its resting cpu usage. As you can see 1.13 uses very little compared to the 1.16 server.

1.13.2:

1.16 (20w06a):