Timeline preview is SLOW and jumpy

One way around the super slow timeline preview that I've found is to just play the audio file and pause it to note the time stamp at which I want different slide elements to fade in.

For example, if I have three bullet points, I play the audio from the editing pane that opens when you double-click, and I write down when I want the bullets to fade in based on the audio. You can see the time that the playhead is at by looking in the bottom right corner of the audio editing window. Then I right-click on the slide element in the timeline, go to Timing... and type in the time stamp I noted. 

In order to preview what I've done (since the timeline playback is super slow) I always do Preview > This slide and publish just that one slide. 

I still think that Articulate needs to fix this (a pretty basic function), but in the meantime this workaround has cut down my development time significantly.