That makes me think we need a throttle at the root (TWSocket).
Would be interesting.
Just switched the roles, installed the mail server on a slow(er) box and ran the TSmtpCli application on the fast(er) one. CPU use of the TSmtpCli application was max 35% whereas the other way around 60%.
Try setting the network speed to 10 Mbps (you should be able to set the speed in the hardware config). I guess you'll see a dramatic drop in CPU usage because your app will be really network bound. If this is really the case, the reverse, that is using 1Gbps, will makes your app CPU bound and this would confirm my analysis.
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