But you do realize that people will quickly stop using your website when it's sucking 100% load out of their CPUs?

My Intel E8400 Core2Duo yields 800 kHash/s = 0,8 MHash/s when under 100% load at both cores.

Given that not everyone will have such a processor (and/or be using netbooks, smartphones, tabs etc), that quite a bit FireFox-Users have No-Script enabled by default and that the creators of this JAVA app didn't code it that way so that the App locks down the User's CPU at 100% load, 50MHash/s sounds pretty reasonable in my opinion.

Sorry.