Della Vega beat his own record 750 BPM

https://youtu.be/XG4GDIqSf14

This guy has a record certificate for 2000 BPM verified by the University of North Carolina.

https://youtu.be/CSaRWt4cxao

Here is an article about a 14 year old kid who has record for most notes in a second verified using special equipment at UC Davis

https://www.abc10.com/article/news/local/14-year-old-going-for-fastest-guitar-record/103-427073205