Can you try on your side to add at least 1000 task in one queue to see if it works well on your side?

HINT: our SQL server is not on the same machine than the CRM but as I said, the fetchxml request does not take more than 1 or 2 seconds to process and the timeout happens after 30 seconds.  It's like if you are trying to process all returned records but without displaying it.

A fast answer would be appreciated.

Thanks