There appears to be a serious problem with the new version of Azureus. It is using 100% of the CPU and not letting go. I have had this problem and Many Others are reporting the same thing too. So it looks like the best option is to putoff updating until they fix this.
I don't think I can directly blame the developers because JAVA is such a nasty language to work in. I don't mean nasty as blaming the language, but if you aren't careful you will get bitten hard because the IDE tools simply aren't as good as what most developers are used to working with now and code bugs are very difficult to find.