Mac takes over a minute to connect to Wifi

Hi there,
This has only just started happening over the past 2 weeks, on bootup it takes around a minute for it to search for any wifi networks and then eventually connects to it.
I have an iMac 27 inch Mid 2010 with an SSD installed so bootup takes around 10-15 secs and then wait a minute for it to pick any wifi up.
I have 10.9.2 installed, not sure if installing 10.9.2 has broke it somehow. Sure I seen a post somewhere about deleting a file but I cannot remember where :-(
Hopefully someone will of had the same issue or can assist in some way!
Thanks so much!

Do any of these suggestions help?
http://howtoapple.com/mavericks-wifi-issues-fix/

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Mac takes over a minute to connect to Wifi

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