My macbook air 11" 2009 wireless problems

my macbook air 11" 2009 has problems with wireless connectivity. I find it takes a while to connect/find a network whether its just booted or come back from sleep. Even then it takes forever to load the initial page but can hang up periodically.
It has only just started since upgrading to Yosemite.
Any idea how to fix it anyone.
Dave

Hi Dave,
Thanks for visiting Apple Support Communities.
It sounds like the Wi-Fi connectivity on your MacBook Air is not operating as expected. There could be several potential causes of this behavior.
The first step I would take to isolate and resolve the behavior is using the Wireless Diagnostic that's built in to OS X.
You can find more information and the steps to use Wireless Diagnostic at this link:
About Wireless Diagnostics - Apple Support
If you can connect to your Wi-Fi router, but are having issues with webpages loading, sending or receiving email, music or video streaming, or downloading, use Wireless Diagnostics. After Wireless Diagnostics has completed an analysis of your Wi-Fi network, it will list any issues it finds and offer some solutions.
Best Regards,
Jeremy

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