Video playback sync - what expectations should I have?

Hi, 

Has anyone else experienced laggy video/motion-path smart shape playback and losing sync with timings set on the slide timeline?

Here is one example:

I want to make interactive videos that have questions or slides pop up. Some of these slides may contain buttons (smart shapes) with audio. The problem I am having is that the videos seem to get quite laggy when playing back on a LMS as a SCORM wrapped project. 

For example I have a 60 second video with an overlay slide 15 seconds in. This overlay slide contains a button that the user must press within a few seconds of it appearing. If they press it within a few seconds the video will continue. If they don't press it in a certain time they branch to a bookmark further along the video showing what would happen. 

In reality when I am playing this back from a LMS the content is choppy and freezes for up to 15 seconds before resuming again and sometimes skipping over parts of the video clip! 

On a separate note I have also had issues with motion path object losing sync with other objects on the time line during playback from LMS platforms. 

If anyone has successfully managed to use Captivate to create branched based video stories or slides with motion paths that don't have lag I'd love to hear how you did it!

Thanks for reading. 

Sources and settings:

Captivate Version: 11.5.1

Windows 10 PC (Alienware R7)

Project output :SCORM 1.2

30 FPS.

800x450 pixels. 

Video: MP4 800x450 30fps. Bitrate 1.5 Mbps

Testsed using SCORM Cloud on iPad A1823 (Safari) and Samsung A50 phone (Chrome).