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Please ensure that the client is using the fixed version of the library sent to you by Mone.

About the polling: there are a few cases in which the client switches to polling.
Usually, it is...

The log in the 1:00 post shows a streaming session, so your environment is adequate;
in the previous case there may have been some side effect.
So, the "big message" test was in polling, whereas...

The log shows that the involved session is in polling, which obviously may alter the times further.
Was it an unlucky case or is it possible that your test environment does not support streaming?
...

The <max_delay_millis> setting allows batching of updates in a single packet.
The batching involves updates for different items and, depending on the kind of subscription, also subsequent updates...