How can you save KiwiSDR IQ, waterfall and S-meter data streams to play later?

What's the most efficient way to capture all the incoming KiwiSDR data (from any Internet KiwiSDR) and save it so it can be used to make a video from the saved files? (Is there one?)
Currently I'm doing a live video screen capture from the SDR and making an IQ recording. But the video capture makes heavy demands on the system.
It seems to me that the waterfall and S meter data could be saved to files and processed later with much more efficiency. Is there a way to do this now AND to listen live at the same time?
Daz
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