Perhaps it would be good to enlist the help of another. I eman chess notation is already shorthand so if writting it yourself is taking a long time then your options seem to be limited to getting faster or getting help.
Maybe you could also use a camera to just film the game?
Okay, I'm open for some suggestions. In OTB tournament game, I get to under five minutes and stop keeping score... in many cases I get to the final few seconds.
So I get home and often cannot recreate the games yet I want to study them. Any suggestions on keeping score when time is low?