When starting the server, the TPS is normal at 20. After a few hours, this degrades further and further until reaching only 5 TPS. This is with enough RAM allocated. CPU usage spikes then and again to 100%. I've attached two debug reports, one before the restart, and one after.
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Duplicate of MC-138550
It's okay being duplicate. [Mojang] slicedlime wrote that users should open new issues with bad performance reports.
Reopen it.
Seeing very similar in Single player. TPS just drops over time without any apparent cause.