Hm, strange. I cannot seem to replicate this. I did not see any significant memory increase after loading up blackjack on fresh opens of both firefox and chrome. In chrome, I went to the chrome://memory-redirect/ page, and it looks like my bitZino blackjack tab is only using 25,508k. In firefox, I went to about:memory, and it looks like my blackjack tab is only using 12.79 MB.

Is it possible that something else on your system is causing the memory spikes?