Timeout: The file lock 'some/path/to/8738.tldextract.json.lock' could not be acquired

I start getting this error when I increase the number of processes / threads to a certain point.

Is there a way to increase the timeout value?

More importantly, why is lock needed here if tldextract isn't writing anything, only reading?

Reproduce the timeout using increased process or thread concurrency and inspect the file-lock behavior for the mentioned tldextract cache path. Determine why the lock is needed for read-only use and define completion as a documented or tested resolution for concurrent access, including the timeout question.

Written by the indexing model from the issue text.