Wifi is terrible, excellent with Mountain Lion

[bontempi]

Hi

Yosemite really screwed my Macbook Pro 15" 2012 wifi connection.

Connecting to the wifi is very slow, often fails. Then, wifi randomly stops working, sometimes i get a beachball and safari becomes unstable, the only fix is to disconnect the wifi and re-connect it. Airplay video performance is terrible, with very slow framerate and butchered sound. Problems appeared as soon as i installed Yosemite, and haven't been fixed by 10.10.3.

I've installed Mountain Lion on a separate partition, and wifi is perfectly fine here, so is Airplay. Maverick was also fine, never had a problem.

Any help ?

 

[Stylobic]

at least you have the possibility to install previous OS, I cannot on my 2015 macbook pro and have to live with this crappy wifi ! And if it was the only yosemite issue...

 

[ABC5S]

I'm using the most current Apple Extreme / Have the fastest DNS server / My router mode is DHCP & NAT / and changed my location to where I live in Network settings & using Yosemite , and not one issue to report.

 

[Taz Mangus]

Hi

Yosemite really screwed my Macbook Pro 15" 2012 wifi connection.

Connecting to the wifi is very slow, often fails. Then, wifi randomly stops working, sometimes i get a beachball and safari becomes unstable, the only fix is to disconnect the wifi and re-connect it. Airplay video performance is terrible, with very slow framerate and butchered sound. Problems appeared as soon as i installed Yosemite, and haven't been fixed by 10.10.3.

I've installed Mountain Lion on a separate partition, and wifi is perfectly fine here, so is Airplay. Maverick was also fine, never had a problem.

Any help ?

Try a little experiment:

• Create a new partition on your internal hard drive.
• Install a clean version of Yosemite to the new partition.
• Boot to the new partition where you installed the clean Yosemite. Don't install anything new, leave Yosemite as a basic install.
• Setup WiFi like you previously did. See if the WiFi issues still happens.
• When you are done, boot back to your primary Yosemite partition and delete the new partition.