Five Crash reports attached.
Frequency of crashes increased as world got larger. Unplayable at this point, as crash happens about a minute after joining server.
Crash reports attached
Related issues
duplicates
Attachments
Comments

[media][media][media][media][media]

I noticed those watchdog messages, saying it took more than 60 seconds for a tick.
But there is clearly a deeper issue going on, since this happens with a single client, talking to a dedicated server in the same room, using direct connect. This implies performance is atrocious.