>>>Don't see how it can be a routing problem.
>>>
>>>If I select the 'root' message on this thread and click 'View all from this message' the response takes about 2 seconds.
>>>If I click 'View all' then the response takes 30+ seconds.
>>>Same number of messages on either.
>>>
>>>Presumably they are both routing to the same server.......
>>
>>Which thread ID is it?
>
>This thread : 1561695

AFAICS the requests are identical except that the fast one specifies a 'Start' parameter in the query string.....