Can iMac5K run on mavericks to try to make it work?

can iMac5K run on mavericks to try to make it work?
with yosemite 10.10:  streaming fails, bonjour fails, wifi fails, airplay fails, even wired browsing safari fails, apps can't load or open, apps can't sense their servers to activate, wifi is disturbed for other users on network, computers rename and sharing does not work as expected, screen redraw stops, leaving a stalled finder window without visible list of contents, not even text will show up, parts of photographic images are pixelated, I added 32 g upgrade and little changed. Old 2.66 quad 4, 1 is faster with 20G ram and old sata not faster than 7200 rpm. New iMac 5K can't even open images. Is there a way to downgrade to mavericks even though it is not specified for the new imac5K?
Is there an update for the terrible airdrop/airplay/wifi issues? Dropbox is not working correctly. Creative cloud is confused.
I backup manually so at least I don't have time machine creating multiple images of the drive right now.
This is a high price to pay for a slow, faulty computer that does not deliver. The screen wallpaper looks nice, but the machine can't stream video.  When will apple address the wifi issues?

No. The iMac 5k requires Yosemite.

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