How can I tell how long a request has been sitting on an execute queue?

Is it possible to determine (in WL 8.1 and/or 10.3) how long an HTTP request has been sitting on the execute queue before being assigned to a servlet?
Under heavy load, I'm finding that the caller times out by the time the servlet tries to write the response because the request has been waiting on the execute queue for too long. To prevent doing all the work to process the request, I want to be able to see how long the request has been waiting to determine whether it's worth processing the request.
Currently I use the getExecuteThreadTotalCount() method in ExecuteQueueRuntimeMBean and assume that if the count is high, the request has probably been waiting for a while, but getting the actual time on the queue would be much better.
Thanks.

Further investigation and a bunch of speed tests later, I'm even more puzzled. Between 7 pm and 9pm this evening, download speed has been consistently at 112kb, except for the 1 in 10 occasions where it hits 1.5mb, for 30 or 40 seconds, before dropping back to 112kb.
Does anyone have any ideas what is going on?
thanks in advance
Ben

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