Rose: That was my biggest complaint when i first started using firefox. Very quick on all other sites, but like your problem Rose - slowed me down here. So I used firefox almost everywhere else and IE here.
Now Firefox works great for me. The way I solved it was to move to a faster internet connection (but of course that is not a solution for everyone.)
The problem: Firefox websites quicker because they start to show you things right away. But for BrainKing, that backfires a little because first it shows you the left frame (main menu). It then moves that over to also show the middle fram (game board). It then moves that over to show you the right frame.