Why does 4k "Set to Frame Size" shrink on playback ?

When I add 4k video to a 1080 timeline and shrink (scale) to 50% to make it fit, it fits perfectly when paused, but then plays back at half size within the 1080 program sequence window.  I believe this is the preferred way to put 4k on a 1080 sequence but I am not sure why my playback shinks the size of the video further when I play it.  Thanks for helping me understand what's going on here or if there is a better way to bring 4k into a 1080 sequence. 

PR CC 2014.1. I just tested some GH4 4K (3840X2160) in a 1920X1080 sequence, scaling the 4K to 50%. Program monitor settings 1/4 and Full are okay, and 1/2  gives me constant jumps from full frame to a small box in the monitor. (Same whether playback and pause settings are matched or not.)
Removing the scale, gives the same type of effect. Stepping through frame by frame, I see that most frame are showing as full frame, then "zooming" in to the "regular condition" (no scale should display the too large 4K centered, right?).
Generating previews results in relatively smooth in all combinations.
Also, using the "scale to frame" results in smooth motion even if not rendered.
GH4 4K clips are 100Mbps recording. I suspected my system (just on my laptop) was not up to the task. But since unscaled is not the issue, I really don't know. I'll try to test this again on my PC at home tonight.

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