It did not get confused by my heavy accent, and the result is surprisingly good:
https://jonatron.github.io/fosdem2023whisper/files/fast_data...
Original: https://www.youtube.com/watch?v=JlcI2Vfz_uk
But some mistakes are hilarious!
> 500 megabytes per second, Britain.
Britain. Guess what it actually was :)