Netty Warm Up Stage

[zx spectrum]

When I send / receive 10,000,000 messages to try to measure the rate, I see
that Netty spends some time to warm up:

   consuming rate: *64800* messages/s
   consuming rate: *106016* messages/s
   consuming rate: *143905* messages/s
   consuming rate: *177714* messages/s
   consuming rate: *203981* messages/s
   consuming rate: *228632* messages/s
   consuming rate: *252397* messages/s
   consuming rate: *272507* messages/s
   consuming rate: *291819* messages/s
   consuming rate: *309933* messages/s

This is the average rate of the messages ( that pass through FrameDecoder )
received per each million.

Can anybody explain *why *it happens? And how to eliminate a "warm up"
stage?

Thank you!!
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