[20:24:19] [Server thread/INFO]: 7578 biome parameter points were mapped for BYG region: byg:region_0
[20:24:19] [Server thread/INFO]: 7578 biome parameter points were mapped for BYG region: byg:region_1
[20:24:19] [Server thread/INFO]: 7578 biome parameter points were mapped for BYG region: byg:region_2
[20:24:19] [Server thread/INFO]: 7578 biome parameter points were mapped for BYG region: byg:region_3
[20:24:19] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 26863ms or 537 ticks behind

In server.properties, try to change sync-chunk-writes from true to false. On my server all lag is gone. Before that it was just unplayable.

That seems to have fixed the issue.

Same here, running a ATM7-0.4.23 linux server. As soon as new Chunks are generated TPS goes through the roof. Moving around in already generated Chunks everything seems completely fine though.
Some relevant Hardware Information:
i3-12100
16GB DDR4-3200 RAM
Storage consist of multiple NAS drives which i guess are the problem, didn't seem to be in previous versions though.

In server.properties, try to change sync-chunk-writes from true to false.
On my server all lag is gone. Before that it was just unplayable.

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