The reason it doesn't 'turn off' is because it's not [just] updating from the internet. It's also importing as much file information as possible. The more things you have the longer it takes and even leaving it running and then not seeing the message doesn't
mean it's finished. For comparison, I have about 4 computers currently in my home, all but my HTPC running Windows 7.
My main computer displays that message and did for a long time the first time I got my library imported but after that the time got way shorter. It starts again when I add more directories to my library and it didn't just do what I added, it scanned over everything
(I'm guessing it checks for any changes constantly). That MAY be why people think it's doing it constantly. If your first time took an hour or more, once it's 'done', any time AFTER it really has done will probably only be 10 or so mins if that much.
I've never had a problem of high CPU or ram usage, but I have a Q6600 and 8GB of ram so maybe it doesn't impact me much? I just added a directory to my library so it would kick in again and I'm currently seeing 5% CPU use. Also, playing video and music is fine
on this end with the updating going.
My other PC is an older machine, Athlon64 3500 with 2GB of ram and I only have 1 music directory on that with about 4gb of music. It does update when I startup WMP but it only does it for 10 or so minutes if that much and also has no effect on performance.
I also have W7 on my laptop and it's the same deal. I don't store much media on there because I stream everything from my main PC or my HTPC but I have maybe a gb or 2 of music/movies/pics on there and it does update whenever I open WMP but it only does it
for 10-15 mins and doesn't hurt the laptops performance. Generally I'll start up WMP and immediately watch a video in bed and there's no problem.
You may also want to uncheck volume leveling if that is ticked. I can see that slowing down your PC, though I have that selected and as I mentioned am fine.
In summary, I don't think it's a problem.
There's something else going on with your PC I'm thinking. Maybe you need a little upgrade or something else is dragging down WMP.
Codec packages can do that.