In case you are struggling with Yosemite WiFi lags like slow emailing, slow surfing, and slow-whatever-has-to-do-withweb turn off AirDrop!
You can shutdown the very aggressive AirDrop with this terminal command:
TL,DR: AirDrop sends very often and especially when you have multiple Apple devices (Yosemite + iOS) the cause so called network collisions (that is when multiple services try to go through one connection). After a collision your OS will try to resend the collided packets again and try over and over until they are transmitted. However this 'try over and over' takes a while which slows down everything and causes even more collisions.
sudo ifconfig awdl0 down
TL,DR: AirDrop sends very often and especially when you have multiple Apple devices (Yosemite + iOS) the cause so called network collisions (that is when multiple services try to go through one connection). After a collision your OS will try to resend the collided packets again and try over and over until they are transmitted. However this 'try over and over' takes a while which slows down everything and causes even more collisions.
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