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AlwaysOn: primary sync or async?

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Hi, I succesfully setup an AlwaysOn between two sql2014 servers for development purposes. I configured both the primary and the secondary as synchronous. Now developers say that it is slower than one single server, and they are right because this configuration causes delays. So, I know I can set the secondary replica as asynchronous, but the wizard lets me to set also the primary as asynchronous, and I can't understand this. Honestly, when I set up the environment, I didn't focus on it but now I'm asking: why should the primary replica be async? If it is the primary (let's say the "most important") it should be sync by default. Who should be the primary async with?

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