Everything should be quicker; I mean from loading the game to responses from customer-support must be quicker. We are all at gambling sites to find entertainment and making us waiting for more than expected/usual time must be annoying for any gambler. I support fun-seeking gambling still customer support is more important when gambling sites are dealing with actual hard-earned money.

For that you might stick within altcoin transactions and with BTC, you might need to wait for at least 10 minutes. If your term "instant" falls within 10 minutes then I guess you will not be having any problem on using BTC for your gambling .