Hmmm I think your porblem is internet connection or server connection.
I heard that there were error's with windows 8.
Possibly your windows 8 cp can't run big GB, MB games.
Keep playing sf until the lag will stop. Don't have too much tabs like internet browser on when your playing it will reduce the lag.
My best suggestion is use game booster. Link: http://www.iobit.com/gamebooster.html
Hope this helps!