Exchange Server 2013 Email Performance with Rules

Hi All,

I noticed that in Exchange Server 2013 Sending & Receiving Emails with Transport Rules applied to these emails are Slower than Exchange 2007.

The Environment was Exchange 2007 with latest Updates and Service Packs and Internal Emails usually takes 5 Seconds Maximum to be Received but when upgraded to Exchange 2013 Internal Emails Exactly now takes 20-22 Seconds to be Received .

How i can increase the performance of the emails to be the same as before?

Thanks.

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