Macbook Upgrade Yosemite OSX

As I am watching new questions (on EE) come along I have noticed a common trend of users having issues with Yosemite and the user's degraded wifi performance.  All are various issues of course, but the main thing I notice is its when users upgrade from Mavericks to Yosemite.

What are the reasons for this?  Why is Mavericks seemingly different than Yosemite in regards to wifi?
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Kyle SantosQuality AssuranceAsked:
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Michael-BestCommented:
"What are the reasons for this?  Why is Mavericks seemingly different than Yosemite in regards to wifi?"

Wait for OS upgrades.
New OS's are released before they have been tested thoroughly and bugs removed.
Eoin OSullivanConsultantCommented:
Kyle

From what I have experienced it appears to lie in the decision to incorporate Handoff between iOS and OSX in Yosemite.

The whole hand-off process involves iOS and OSX devices constantly broadcasting what they're doing over a combination of WiFi and Bluetooth so that you can open email, browser etc between your devices.

Unfortunately this hand-off system is very complex and affected certain wifi and bluetooth cards more than others.

I had to wait to 10.10.3 before my iMac finally started to behave properly .. prior to that 10.10.1 and 10.10.2 still caused problems with slow and buggy wifi and I had to disable the whole handoff brodcasting process to get wifi to behave.
serialbandCommented:
They went to "Agile" release cycles and are basically releasing "betas" to the users.  Their release cycles were a bit slower previously.  They seem to be rushing the most recent releases, possibly trying to obsolete the older copies that were still technically purchased, since Apple only supports the 2 latest versions of their OS.  The latest copies are licensed, at least in the USA, due to the 9th Circuit Court ruling of Vernor vs. Autodesk.  https://en.wikipedia.org/wiki/Vernor_v._Autodesk,_Inc.  This ruling does not apply to the rest of the world, just the USA, although that won't stop the media juggernaughts from the US from trying to enforce it with everyone.
David AndersTechnician Commented:
From  Macissues  May 27, 2015
http://www.macissues.com/2015/05/27/apple-ditching-discoveryd-for-mdnsresponder-in-latest-os-x-10-10-release/
Has your Mac been affected by Wi-Fi dropouts, short battery life, and the inability to maintain connections or discover devices on your network after having installed OS X Yosemite? If so, then the problem is likely going to be addressed in a significant way by Apple in the next update to OS X.

The problem is happening because of the introduction of a new DNS resolving service called “discoveryd” that Apple implemented in OS X 10.10 as a replacement to its long-standing mDNSResponder service. The new features of this service are relatively transparent to the end user, and only offer Apple more compatibility with its various iCloud and cloud sharing services.

However, the service was apparently pushed out before it could be properly refined, and introduced bugs and frustrations in OS X that stem from intermittent pauses to dropped connections, to the service taking up massive amounts of CPU and draining the battery on laptops.

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Kyle SantosQuality AssuranceAuthor Commented:
Thank you for your comments.

I have asked other questions here that are relevant to my problem I am experiencing (which is why I asked this question in the first place).

How do I upgrade my wireless software on my Macbook Pro?
http://www.experts-exchange.com/OS/Apple_Operating_Systems/OS_X/Q_28685793.html

Macbook Pro Airplay to Apple TV
http://www.experts-exchange.com/OS/Apple_Operating_Systems/OS_X/Q_28685813.html

I will be accepting solutions here based on what I find answers to in the other questions I have asked.
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