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Which bit is slow?
//get XML from remote URL ;
//remove DTD reference
//parse response XML (using DOM API)
//get specific nodes to read.
500*//extract something ;) from current node
500*//send a response to a remote URL
// cause delay - this is the polling interval
You have a delay that you comment as an interval; you may want to adjust the delay for the processing time so it is more equal to the desired interval.
You also are establishing 500 http connections, which will cost in time. You may want to (if it's to the same endpoint) only send one bulkier message, or to enqueue these and let a pool of threads process them outside of the polling loop (depending whether timeliness of polling or posting has higher priority).
Pete
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