Conclusion

The researchers do also add a few caveats. While 2x viewing was fine for learning about the material in their studies — real estate appraisals and the Roman Empire — perhaps it might not work for more complex subject matter;only more research will tell.

But as so many students do report watching at faster than normal speeds anyway, this work is clearly helpful: it suggests that as long as it’s not more than 2x faster, it’s far from being a bad idea.