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I have built an application to send email mailers for a website through Amazon SES. It is coded in C#. Each email takes .3 seconds to send via the Amazon SES API. That means, using a single-threaded application, I can only send 3 emails per second. I have implemented a producer/consumer, multi-threaded application with 1 producer to query customize the emails for each customer, and 25 consumers to pull from the queue and send the emails. My multi-threaded application sends 12 emails per second (a quadruple speed increase). I would have expected a greater speed increase from a 25-thread application. My question is: How much can I really speed up the sending of a mailer on a single-processor machine ? Do my gains seem reasonable, or is my speed problem more likely due to coding than to the computer's inability to process the emails mroe quickly? Thanks in advance! UPDATE: In case others are facing the same issue.... connecting to AWS in order to send the email takes up a lot of time. The following thread on AWS Developer forums gives some insight (You may need to scroll down to get to the more useful posts). https://forums.aws.amazon.com/thread.jspa?threadID=78737

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