> My understanding of send and send-off, is that with send-off a new
> thread outside the thread pool is used to run the agent action.

Actually a different kind of thread pool is used for send-off. It is a
cached thread pool obtained from Executors.newCachedThreadPool(),
while send uses a thread pool obtained from
Executors.newFixedThreadPool().

With send-off, your action may have to wait for thread creation (but
not if a thread is available in the cache), but will not have to wait
for a thread to complete another action. With send, you don't wait for
thread creation, but you may have to wait for a thread to be free (if
all threads in the fixed pool are busy with other actions).
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