That is a very bad idea! There is a lot going on in a D&D slide, some time is needed to evaluate all the scripting, loading. Never reduce a slide to such a short duration unless you need a dummy slide that is just needed to execute a script and not for viewing objects. This is my first answer, based on many years of experience with Captivate.
How did you create the background? I hope you used the image and applied that as background, not imported the PPT slide? If you import a PPT-slide it is converted to a movie slide, which could explain your issue.
Depending on the actions you specify for Success/failure, only the active part of the slide will be 'scrubbed', default is indeed 1.5sec. Why use a playbar if you find the movement distracting? You can easily create custom navigation and toggle buttons for other functionality like CC, TOC, Audio. Moreover, such a progress bar has only sense for a simple linear project, where most engaging eLearning courses will have branching, non-linear navigation which makes that progress bar not distracting, but simply confusing to the user. A default 3 seconds for most slides is just fine, allows possible actions to be executed On Enter and eventually On Exit, transitions and effects to appear. It is also very short, 3 seconds, unless you have a course with very few slides.
Now the answer: it is possible to change the pausing point for the D&D on its panel, Tab 'Actions'. I could easily reduce it to 1sec instead of 1.5secs. Use the Timing Properties panel to reduce the slide duration. But please, do not use 0.2 secs for the reasons I tried to explain.