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Exchange 2013 slow delivery to outside

the emails take a while to delivery to outside, the emails internal delivery fast but when we send to clients o gmail, hotmail or some other take a while, which could be the problem?

I check the queue viewer in exchange and take a while to delivery at least 10 minutes but the emails are delivery after sometime
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Rajkumar Duraisamy (Rajkumar-MCITP)
Top Expert 2012
Commented:
Copy the Message Header from gmail (open the email -> click on the 3 dots at right corner -> select show original -> Copy the contents -> open http://testexchangeconnectivity.com -> Message header -> past the copied message and analyze the header to see from which server the mail got delayed)

You can check that server performance etc to ensure fast mail delivery