NServiceBus: Does MSMQ go to "sleep"?

Normally messages with NSer开发者_运维知识库viceBus seem to be transferred pretty fast, but it seems like if I haven't sent any messages for a while, it takes a few seconds for them to be received. Does anyone know why that would be? If MSMQ is indeed "going to sleep" is there a setting to "keep it awake"?

I'm betting this is because MSMQ keeps idle connections open for only so long. If this is an issue check out the Idle Timeout registry setting: http://msdn.microsoft.com/en-us/library/aa922753.aspx