New iMac with factory installed Yosemite underperforms compared to much older Macs. What do do?

Very, very disappointed with Yosemite. Brand new iMac 27 lags awfully compared to my MB 17 and even MB Air. Discounting the fact that many apps will not even instal, those that do (and which never crashed before), fall apart on iMac at least once a day (Garage Band, Firefox, SoundForge, SpeakIt!). The most madenning thing is the networking – both Mavericks machines take seconds to copy 50-100Mb files to Time Capsule via wifi, while iMac needs minutes. Even reading folders on network drives takes forever. And sadly, network file swapping is a must, since AirDrop in 10.10.2 is totally useless (persistently fails half way). The only option seems to downgrade to 10.9... Any ideas are appreciated.
Feb 2014 non-retina iMac 27 (i7/ 8gb/ 4gb GTX 780M/ Fusion drive/ factory instal Yosemite)
2011 MB Pro 17 (i5/ 8gb/ Mavericks/ hybrid drive)
Mid-2012 Air 11 (i7/ 8gb/ ssd/ Mavericks)

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