Fast enough. 8-10 knots is pretty comfortable and a nice cruising speed. Going over that can be fun for short periods, but it isn't relaxing. I've been 13 knots in the middle of the night and didn't like it much. I'm more interested in keeping the boat moving in Florida's typical light air than I am setting speed records.
My information indicates that previous owners have had her up to 18 knots. Speed stories are sometimes like fish stories, but it does give me an idea of what happened to the first mast.