Effect of double-speed playback
A paper that tried 1x, 1.4x, and 1.8x in three different ways and found no significant difference in comprehension, but satisfaction was significantly highest at 1.4x.
The effects of time-compressed audio and verbal redundancy on learner performance and satisfaction - ScienceDirect
Double speed makes no difference in comprehension PDF.
https://twitter.com/takamuto_kyoto/status/1395952037741809665?s=21
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