Why is my video showing a "slow playback detected" error?

Ellacard FAQ: Why is my video showing a "slow playback detected" error? (Troubleshooting)

A "Slow playback detected" message means your device or internet connection isn’t fast enough to play the video.If you get a "Slow playback detected" message, try changing your device and networkTry watching the video on a new device or network first. If you still have issues, email us at support@ellacard.com and we’ll promptly assist.