To get the cpu usage, just open up a new Terminal window (Applications/Utilities), and then type "top", and you should see the CPU/memory usage in that window. If it doesn't show iTunes (which it should since iTunes is usually a mem/cpu hog compared to other processes), then just press Control-C, expand the Terminal window, and then type "top" again.
I was going to post a new thread and rant but this one will do.
when I use iTunes it drags the whole system. It never skips which is good but Omni or Mozilla become unbearable. I ran top and found it to be using 30% of my cpu
Then I installed xmms via fink and I used it when I was xwindowing. I decided to run a test to see how they matched up. With iTunes and xmms running, plus XDarwin and OroborOSX to make xmms work, and top to calculate the results, iTunes ate 30% of my process power on average. xmms took 10% plus 5% for XDarwin and 3% or so for OroborOSX. How is this possible?
I have done stuff in the past where I use nice to set the priority of iTunes lower and that makes surfing reasonable on my 266 mhz iMac but iTunes skips. xmms skips too but in order for me to get itunes at 18% process power it skips a lot more than xmms does.
I just recently found a skin for xmms that makes it look better than iTunes (No brushed metal means better continuity with the system and MUCH less screen space taken up)
I'll never give up iTunes forever but I just find it incredible that it takes almost twice as much power for iTunes than xmms combined with all the stuff to get it going.
I used to have LinuxPPC 2000 installed on my computer and XMMS used about 3 to 5% CPU time. iTunes plain and simple is a CPU HAWG. It must be doing A LOT more than XMMS, that's the only possible explaination. iTunes takes anywhere from 12% to 25% on my computer now.
iTunes 2.0.4 has helped out a little bit on response problems, but I'd say the biggest problem is that it's "a bad Carbon port".
Maybe if Apple rewrote it a bit it wouldn't suck so much.
I've always found that even when running iTunes though, nothing else slows down. For example, when playing Unreal Tournament and iTunes at the same time, the computer doesn't lag any more than normal, and iTunes doesn't skip. Performance is still the same. That may just be me, but it would still be nice if Apple could make iTunes take only a few % of the CPU idling.
hell, we've been playing mp3s since we had PowerPC 601 machines (like the PowerMac 8200/120). And iTunes uses way too much of my processor for decoding mp3s. Of course, back then we were used to skipping in those, when we did other stuff in the foreground, but still... This was YEARS ago...