Lag in layers with videos

I have a slide with 5 layers, and all 5 are loaded with videos (ranging between 20-50 MB each). 

The storyline has a lag (between 2-6 seconds) when the learner clicks on the video link in the base layer and the time the actual video is played.

Need support in this case. Looking forward to a solution. Please share your experience and workarounds.

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