I feel iTunes issues in particular have always been a bit more than any PC I've owned can handle or rather, the program itself is way more than most Pc's can handle, unless you just have it running alone. I have a top of the line PC- iTunes processes still kick my processor's ###.
Furthermore, Internet connectivity presents its own issues also that add to the situation and initiate the problem which is agitating bc I get excuses from my ISP - mostly "high internet traffic", so they confirm that connectivity is a presenting reason for the issues but tell me to wait to use when there's less activity. Ummmm...what? đ. Microsoft scoffs when I've contacted them or displaces blame; they don't even offer suggestions which is disappointing. Apple was the only one who took time to help me isolate issues. I was in great shape for a while, but I got lax and have now forgotten what we did to resolve and maintain steady use of iTunes and access to the App store.
On my Mac, iTunes takes a while to pull up but it's actually the App store that gives me fits. It's an absolute nightmare waiting on it to simply open.
After I close windows & programs I have open, and allow network access to focus on my PC or Mac versus having all of my devices pulling from my network, everything works fine overall. Otherwise, I can count on iTunes issues to occur on the PC & the App store taking ages to pull up on the Mac.