High CPU load after waking with Thunderbolt Display connected

I have a Mid-2013 MacBook Air 13" with Apple Thunderbolt Display connected. I use this setup mostly in a clamshell mode. Recently I've updated to OS X Mavericks. After that I've noticed that one of the cores is occupied by kernel_task to 100% after waking up from sleep. I've managed to isolate that to Apple Thunderbolt Display connected, without display there is a short CPU spike, but it comes down to normal levels in a couple of seconds.
I've tried resetting SMC to no success. MacBook doesn't enter Safe Mode either (progress bar goes up to approx. 30% and it goes to reboot). Probably it's because of the Thunderbolt Display, I'm not really sure.
That's not really a problem as this load doen't seem to impact CPU temp (fans are not spinning faster) and more of a activity monitor display glitch (?).
Does anyone here encounter this?

Hey Max,
I also have one CPU core on my Air'13 to run 100% after a wake-up for about 1 minute (kernel_task).
It is annoyingly like this after I upgraded to Maverics. Notice, I don't have a Thunderbolt monitor, just a laptop, no periphery.

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