Running 1.13-pre1 and getting lag spikes every few seconds, making it unplayable. I have ran 1.12.2 just fine, not lag spikes at all. I'm not sure what the issue.
I did a force crash report (F3 + C) hoping that would provide some information on what the cause could be.
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I think it is that you have a lot of entity's in the world that are loaded, but I'm not sure! Take my commet with a grain of salt...