Worksites may occasionally have extremely poor performance, taking server tick times from ~13ms to ~80ms for a single bugged out worksite.

Breaking the worksite and replacing it solves the performance problem immediately.

Seems to be related to inventory overflow according to server profiling/debug logging.

Definitely related to overflow inventory -- a tree farm with stuff in overflow will -eat- up tick time on a server. Removing the items from overflow will immediately cure the problem, don't need to even break the block