The MacWorld writer noticed that the iTunes Store uses an enormous amount of CPU to simply display a front page, and rotate graphics in the carousel at the top of the page.
McElhearn posted screenshots of his laptop with the iTunes Store open and playing a song at 18% CPU use, compared to just playing the song at 5% CPU use.
Lest you think that a lot of the CPU that iTunes is using is to play that Allman Brothers song, here’s what happens if I switch out of the iTunes Store. Together, iTunes and coreaudiod, which processes audio played by iTunes or other apps, use about 7% of CPU.
Take a look at the screenshots below...
Read More [via DF]
With iTunes Store Open:
Without iTunes Store Open: