opera cpu usage

[Michael Havens]

I am running opera as my email and onqueror as my browser. I was running  
top and it was reporting opera was using between 70 and 90 percent of the  
cpu (I had 3 windows on top of it incloding rxvt. Well I brought it to the  
top and top startesaying  cpu usage was between 14 and 30 percent and it  
has been going pretty consistant at that for about 15 minutes. Any ideas  
as to what the problem was? (konqueror cpu usage has stayed below 30%
-- 
:~)MIKE(~: