I'm using silverfish, not sure if the internal bot is faster but I've noticed how slow it is to click on the Play button after a game, and also how slow it is to skip the animations after a win or a loss, when I play I always click really fast to skip them and click really fast on the Play button again, same thing for the auto-concede, it's really slow the bot clicks on concede after a few seconds and not straight away. I've calculated that it takes me approximately 30s to start a game, concede and click on play again, while the bot takes an average of 55s that's almost double.
Why do I say this? because when you farm for golden portrait and have to do 300 games and want to get them done asap, that means you could save hours in total.