Cloudfront Video Lag Issues

Hi, It could be better if your question came with more information, not just saying what is the player you use.

Back to your question, if you have seen your video playback is laggy, strongly suggest you to check it with 'Developer Tools' loaded. (In Windows, you may just press F12), and switch to the 'network' tab.

And then, you could check the 'timing' tab and understand how much time it taken when the sub-actions loaded video chunks(ex: .ts files)

Or, you may save the result as an HAR[1] file and upload it with the question, the HAR file contains lots of information that would be helpful for the analysis.

After that, people could help you without reading your fortune, nor guessing what happens.

[1] HAR File - Capture web session traffic - https://support.google.com/admanager/answer/10358597?hl=en