Timeline slowing down playback / deleting tracks remedies problem

Here's a nasty bug I've been running into lately.
I've noticed (on the latest version of Premiere CC 2014) that sometimes a timeline/sequence in a project will start to slow down during playback. It slows down not only the advance of the playhead (in terms of how often it's refreshing) but more annoyingly, it slows down video playback in the program monitor. It happens even when footage has been rendered and should exhibit minimal stress on the system.
To illustrate that it's just the timeline, not the video itself, the problem can be "fixed" in three ways:
1. Zoom in on the timeline until playback smooths out again. If a small enough piece of the timeline is visible, it seems to smooth out playback again.
2. Maximize the program monitor window (so that it's the only visible window in Premiere) and then again, immediately playback snaps to full speed again. I can full-screen the video playback, etc, without issue. And un-rendered portions of footage with effects applied play better as well.
3. Reduce the number of video/audio tracks. This is what I think is actually slowing down Premiere. But the problem is, I don't have that many tracks to begin with. On the project I'm working on right now, I have 4 video tracks and 5 audio tracks. Simply deleting the bottom 3 audio tracks (which are sparse and only have a few incidental effects) fixes my video/GUI playback problem immediately.
So my question is... why is Premiere slowing to a crawl just because I added a few audio tracks to a project? Apparently my machine is fast enough to edit 4K material off the GH4 with effects applied and not drop a frame. But add a few tracks of stereo audio? Premiere slows to a crawl.
It wasn't like this in previous versions, guys. Please advise.

Try accessing your audio from a different drive location.

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Timeline slowing down playback / deleting tracks remedies problem

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