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If the transaction queues are excessively long, scan times for the waiting for dispatch queue can affect system performance as a whole (see waiting for 1st dispatch Dispatcher statistics). You can use the PurgeThreshold and DTIMOUT parameters to control TCLASS queue size. But be aware that excessive transaction purges can also affect system performance.
If you are never at the limit of your transaction class setting, you might consider resetting its value or review whether there is any need to continue specifying any transaction types with that class.
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