Yosemite Drops WiFi Download Speed 25%

I really had no problems with Yosemite on my late-2013 MBP Retina...until I did a Speedtest.net test of my Internet speed, in this case over a wi-fi connection to my router.
I routinely get 55-60 Mbit/sec download speeds, but with Yosemite I got only 40-45 Mbit/sec, roughly a 25% reduction. In case it was just a slowdown from my ISP, I checked using wired Ethernet, which showed my usual 55-60 Mbit/sec throughput. Toggling immediately back to wi-fi, the speed went back down to the 40-45 Mbit/range.
I saw others with wi-fi issues under Yosemite and tried the proposed solutions that some said fixed the wi-fi speed (and wi-fi drops) problems--turn off Bluetooth for one. Nothing helped. So I restored the Time Machine backup of my Mavericks installation and...everything wifi-related is back to normal. Same network speeds as before Yosemite.
Lesson learned--always do a full backup before a major OS upgrade just in case.

Vano3408 wrote:
Having issue on my D6633 since KitKat, now updated to LP 5.0.2 23.1.1.E.0.1 and still same. When I go in 5 meters from router behind 2 walls and signal strength decrease a bit download speed drops almost to Zero, but upload speed is ok.
Please check below video, I have 46080 / 3072 kbps for download /upload... Tried all possible settings combinations without success. Stamina mode never used..
http://1drv.ms/1DjjkcP
When near router 2-3 m without any obstacles download speed is ok.
Any other my phone (Samsunf S3 for ex.) have no such issue in same location...
Please advise what can cause such issue or it is my Sony hardware specific issue ? How can I solve it ?
This issue is not router specific, because same behavior at home and at work.
just in case following settings I have at home: router in mixed mode, 20/40MHz auto, WMM enabled
Download this and take a look which channel of your router had the best signal and make changes on your router to the best channel within 1-11. Try your speed test again to see if this helps.
https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer&hl=en
You may also want to ensure that no body is downloading or torrent if your home network is shared with other users.
I can accept failure.... I can't accept not trying - Michael Jordan

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