Yosemite became terribly slow after connecting Thunderbolt display

Macbook pro 2011 16GB memory, SSD (instead of HDD), OS 10.10.1
After updating to Yosemite i realize that everything became very slow, all system is terribly slow. Finder, Safari, any other application. It doesnt matter what i use - OS X yosemite became unusable. In activity monitor - just after connecting THD kernel_task starts using 545% of CPU!!!!
But after disconnecting Thunderbolt display - everything goes back to normal.
I try to disconnect al external hdd connected to Thunderbolt display - nothing change.
I try to turn off transparency - also no effect at all, the only solution is not to use Thunderbolt display!
Thunderbolt Bus:
Firmware Version: 25,1
Port Micro Firmware Version: 2.1.3
Please anyone who had the same issue, can you advise something?

TBD is updated to the latest fw, but in Thunderbolt section of system information i got "No device connected", but Graphic/Displays section shows Thunderbolt display Connection Type: DisplayPort

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