Out of interest - the score used for the above was directly from the arrangement by "Peakfiddler" - and here he is giving a full speed rendition, plus a slower walk-through...

@Heinrich - indeed it is an "interesting" bow hold - and - it just goes to show that not everything is as it seems or has some prescriptive idealology like "this is the way to hold the bow" - peakfiddler actually has a separate video talking exactly about this, and how his bow-hold came about - in fact, on his YT page where the video is, I left a comment...  here it is Heinrich - 

extra notes can be good !  ( in the right place of course ! ) - that's what fiddling is all about - you "make it your own" but it is still recognisable as the original tune...  cool !

Speed will come with time and practice - it is not an ultimate goal really - technique and control - well in my opinion - come first...   Although of course - it's always great to listen to a player doing a fast jig, reel, hornpipe, whatever really cleanly - lovely and great to watch the rapid left-hand fingering.. and you think - like - WOW !  - just HOW did they do that ? LOL