Can I determine the health of my Airport Extreme?

I want to troubleshoot my Mac 10.10.5 with Yosmite. My wireless movie streaming speed is so slow that I get a mesage while watching a movie that my broadband speed is too slow and that I will only be able to hear the audio. The says that my speed is fine.
Any ideas? I bought the laptop in 2007 so I am hoping that I won't need another one for awhile.
Thanks, Dee

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