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Jun 12, 2015 8:52 AM in response to Pe88lzby lllaass,Maybe interference
http://www.macobserver.com/tmo/article/usb-3.0-hard-drives-can-cause-wi-fi-inter ference
Disconnect all USB accessories and try.
Turn off Handoff:
Connect your iPhone, iPad, iPod touch, and Mac using Continuity - Apple Support
When slow press and hold the Option key and click on the wifi icon in upper left and post a screenshot of the window that appears