Extreme TPS lag (and regularly crashing) if 2+ players are logged in and not rendering same chunks, saw not many of these reports had debug files. Hope this helps!
NOTE there ARE a few small datapacks on the server, if needed I can disable them and rerun the debug.
The lag / crashing was extremely prevalent even before the datapacks were added.
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Please check if that's still an issue for you in 1.15-pre1.