Losing a stone that quickly without exercise is quite an achievement. I know exactly what you mean about wanting it to go faster - when I'm dieting, even if I am getting steady results it seems to take ages. I want it to come off daily.
But... its not going to happen overnight. There is now about 3 1/2 weeks til xmas day, if you lose 3lb a week til then thats another 10 lbs!
Its coming off, so dont worry. Well done.